The System of Nature or the Laws of the Moral and Physical World Volume I Part 2

Those who admit a cause exterior to matter, are obliged to believe that this cause produced all the motion by which matter is agitated in giving it existence. This belief rests on another, namely, that matter could begin to exist; an hypothesis that, until this moment, has never been satisfactorily demonstrated. To produce from nothing, or the CREATION, is a term that cannot give us the least idea of the formation of the universe; it presents no sense, upon which the mind can rely. In fact, the human mind is not adequate to conceive a moment of non-existence, or when all shall have pa.s.sed away; even admitting this to be a truth, it is no truth for us, because by the very nature of our organization, we cannot admit positions as facts, of which no evidence can be adduced that has relation to our senses; we may, indeed, consent to believe it, because others say it; but will any rational being be satisfied with such an admission? Can any moral good spring from such blind a.s.surance?

Is it consistent with sound doctrine, with philosophy, or with reason?

Do we, in fact, pay any respect to the intellectual powers of another, when we say to him, "I will believe this, because in all the attempts you have ventured, for the purpose of proving what you say, you have entirely failed; and have been at last obliged to acknowledge you know nothing about the matter?" What moral reliance ought we to have on such people? Hypothesis may succeed hypothesis; system may destroy system: a new set of ideas may overturn the ideas of a former day. Other Gallileos may be condemned to death--other Newtons may arise--we may reason-- argue--dispute--quarrel--punish and destroy: nay, we may even exterminate those who differ from us in opinion; but when we have done all this, we shall be obliged to fall back upon our original darkness-- to confess, that that which has no relation with our senses, that which cannot manifest itself to us by some of the ordinary modes by which other things are manifested, has no existence for us--is not comprehensible by us--can never entirely remove our doubt--can never seize on our stedfast belief; seeing it is that of which we cannot form even a notion; in short, that it is that, which as long as we remain what we are, must be hidden from us by a veil, which no power, no faculty, no energy we possess, is able to remove. All who are not enslaved by prejudice agree to the truth of the position, that _nothing can be made of nothing_. Many theologians have acknowledged Nature to be an active whole. Almost all the ancient philosophers were agreed to regard the world as eternal. OCELLUS LUCa.n.u.s, speaking of the universe, says, "_it has always been, and it always will be_." VATABLE and GROTIUS a.s.sure us, that to render the Hebrew phrase in the first chapter of GENESIS correctly, we must say, "_when G.o.d made heaven and earth, matter was without form._" If this be true, and every Hebraist can judge for himself, then the word which has been rendered _created_, means only to fas.h.i.+on, form, arrange. We know that the Greek words _create_ and _form_, have always indicated the same thing. According to ST. JEROME, _creare_ has the same meaning as _condere_, to found, to build. The Bible does not anywhere say in a clear manner, that the world was made of nothing. TERTULLIAN and the father PETAU both admit, that "_this is a truth established more by reason than by authority._" ST. JUSTIN seems to have contemplated matter as eternal, since he commends PLATO for having said, that "_G.o.d, in the creation of the world, only gave impulse to matter, and fas.h.i.+oned it._" BURNET and PYTHAGORAS were entirely of this opinion, and even our Church Service may be adduced in support; for although it admits by implication a beginning, it expressly denies an end: "_As it was in the beginning, is now, and ever shall be, world without end._" It is easy to perceive that that which cannot cease to exist, must have always been.

Motion becomes still more obscure, when creation, or the formation of matter, is attributed to a SPIRITUAL being; that is to say, to a being which has no a.n.a.logy, no point of contact, with it--to a being which has neither extent or parts, and cannot, therefore, be susceptible of motion, as we understand the term; this being only the change of one body, relatively to another body, in which the body moved presents successively different parts to different points of s.p.a.ce. Moreover, as all the world are nearly agreed that matter can never be totally annihilated, or cease to exist; by what reasoning, I would ask, do they comprehend--how understand--that that which cannot cease to be, could ever have had a beginning?

If, therefore, it be asked, whence came matter? it is very reasonable to say it has always existed. If it be inquired, whence proceeds the motion that agitates matter? the same reasoning furnishes the answer; namely, that as motion is coeval with matter, it must have existed from all eternity, seeing that motion is the necessary consequence of its existence--of its essence--of its primitive properties, such as its extent, its gravity, its impenetrability, its figure, &c. By virtue of these essential const.i.tuent properties, inherent in all matter, and without which it is impossible to form an idea of it, the various matter of which the universe is composed must from all eternity have pressed against, each other--have gravitated towards a center--have clashed-- have come in contact--have been attracted--have been repelled--have been combined--have been separated: in short, must have acted and moved according to the essence and energy peculiar to each genus, and to each of its combinations.

Existence supposes properties in the thing that exists: whenever it has properties, its mode of action must necessarily flow from those properties which const.i.tute, its mode of being. Thus, when a body is ponderous, it must fall; when it falls, it must come in collision with the bodies it meets in its descent; when it is dense, when it is solid, it must, by reason of this density, communicate motion to the bodies with which it clashes; when it has a.n.a.logy, when it has affinity with these bodies, it must be attracted, must be united with them; when it has no point of a.n.a.logy with them, it must be repulsed.

From which it may be fairly inferred, that in supposing, as we are under the necessity of doing, the existence of matter, we must suppose it to have some kind of properties; from which its motion, or modes of action, must necessarily flow. To form the universe, DESCARTES asked but matter and motion: a diversity of matter sufficed for him; variety of motion was the consequence of its existence, of its essence, of its properties: its different modes of action would be the necessary consequence of its different modes of being. Matter without properties would be a mere nothing; therefore, as soon as matter exists, it must act; as soon as it is various, it must act variously; if it cannot commence to exist, it must have existed from all eternity; if it has always existed, it can never cease to be: if it can never cease to be, it can never cease to act by its own energy. Motion is a manner of being, which matter derives from its peculiar existence.

The existence, then, of matter is a fact: the existence of motion is another fact. Our visual organs point out to us matter with different essences, forming a variety of combinations, endowed with various properties that discriminate them. Indeed, it is a palpable error to believe that matter is a h.o.m.ogeneous body, of which the parts differ from each other only by their various modifications. Among the individuals of the same species that come under our notice, no two resemble exactly; and it is therefore evident that the difference of situation alone will, necessarily, carry a diversity more or less sensible, not only in the modifications, but also in the essence, in the properties, in the entire system of beings. This truth was well understood by the profound and subtle LEIBNITZ.

If this principle be properly digested, and experience seems always to produce evidence of its truth, we must be convinced that the matter or primitive elements which enter into the composition of bodies, are not of the same nature, and consequently, can neither have the same properties, nor the same modifications; and if so, they cannot have the same mode of moving and acting. Their activity or motion, already different, can be diversified to infinity, augmented or diminished, accelerated or r.e.t.a.r.ded, according to the combinations, the proportions, the pressure, the density, the volume of the matter, that enters their composition. The endless variety to be produced, will need no further ill.u.s.tration than the commonest book of arithmetic furnishes us, where it will be found, that to ring all the changes that can be produced on twelve bells only, would occupy a s.p.a.ce of more than ninety-one years.

The element of fire is visibly more active and more inconstant than that of earth. This is more solid and ponderous than fire, air, or water.

According to the quant.i.ty of these elements, which enter the composition of bodies, these must act diversely, and their motion must in some measure partake the motion peculiar to each of their const.i.tuent parts.

Elementary fire appears to be in Nature the principle of activity; it may be compared to a fruitful leaven, that puts the ma.s.s into fermentation and gives it life. Earth appears to be the principle of solidity in bodies, from its impenetrability, and by the firm coherence of its parts. Water is a medium, to facilitate the combination of bodies, into which it enters itself, as a const.i.tuent part. Air is a fluid whose business it seems to be, to furnish the other elements with the s.p.a.ce requisite to expand, to exercise their motion, and which is, moreover, found proper to combine with them. These elements, which our senses never discover in a pure state--which are continually and reciprocally set in motion by each other--which are always acting and re-acting, combining and separating, attracting and repelling--are sufficient to explain to us the formation of all the beings we behold.

Their motion is uninterruptedly and reciprocally produced from each other; they are alternately causes and effects. Thus, they form a vast circle of generation and destruction--of combination and decomposition, which, it is quite reasonable to suppose, could never have had a beginning, and which, consequently can never have an end. In short, Nature is but an immense chain of causes and effects, which unceasingly flow from each other. The motion of particular beings depends on the general motion, which is itself maintained by individual motion. This is strengthened or weakened, accelerated or r.e.t.a.r.ded, simplified or complicated, procreated or destroyed, by a variety of combinations and circ.u.mstances, which every moment change the directions, the tendency, the modes of existing, and of acting, of the different beings that receive its impulse.

If it were true, as has been a.s.serted by some philosophers, that every thing has a tendency to form one unique or single ma.s.s, and in that unique ma.s.s the instant should arrive when all was in _nisus_, all would eternally remain in this state; to all eternity there would be no more than one Being and one effort: this would be eternal and universal death.

If we desire to go beyond this, to find the principle of action in matter, to trace the origin of things, it is for ever to fall back upon difficulties; it is absolutely to abridge the evidence of our senses; by which only we can understand, by which alone we can judge of the causes acting upon them, or the impulse by which they are set in action.

Let us, therefore, content ourselves with saying WHAT is supported by our experience, and by all the evidence we are capable of understanding; against the truth of which not a shadow of proof, such as our reason can admit, has ever been adduced--which has been maintained by philosophers in every age--which theologians themselves have not denied, but which many of them have upheld; namely, that _matter always existed; that it moves by virtue of its essence; that all the phenomena of Nature is ascribable to the diversified motion of the variety of matter she contains; and which, like the phoenix, is continually regenerating out of its own ashes._

CHAP. III.

_Of Matter.--Of its various Combinations.--Of its diversified Motion, or of the Course of Nature._

We know nothing of the elements of bodies, but we know some of their properties or qualities; and we distinguish their various matter by the effect or change produced on our senses; that is to say, by the variety of motion their presence excites in us. In consequence, we discover in them, extent, mobility, divisibility, solidity, gravity, and inert force. From these general and primitive properties flow a number of others, such as density, figure, colour, ponderosity, &c. Thus, relatively to us, matter is all that affects our senses in any manner whatever; the various properties we attribute to matter, by which we discriminate its diversity, are founded on the different impressions we receive on the changes they produce in us.

A satisfactory definition of matter has not yet been given. Man, deceived and led astray by his prejudices, formed but vague, superficial, and imperfect notions concerning it. He looked upon it as an unique being, gross and pa.s.sive, incapable of either moving by itself, of forming combinations, or of producing any thing by its own energies. Instead of this unintelligible jargon, he ought to have contemplated it as a _genus_ of beings, of which the individuals, although they might possess some common properties, such as extent, divisibility, figure, &c. should not, however, be all ranked in the same cla.s.s, nor comprised under the same general denomination.

An example will serve more fully to explain what we have a.s.serted, throw its correctness into light, and facilitate the application. The properties common to all matter, are extent, divisibility, impenetrability, figure, mobility, or the property of being moved in ma.s.s. FIRE, beside these general properties, common to all matter, enjoys also the peculiar property of being put into activity by a motion that produces on our organs of feeling the sensation of heat; and by another, that communicates to our visual organs the sensation of light.

Iron, in common with matter in general, has extent and figure; is divisible, and moveable in ma.s.s: if fire be combined with it in a certain proportion, the iron acquires two new properties; namely, those of exciting in us similar sensations of heat and light, which were excited by the element of fire, but which the iron had not, before its combination with the igneous matter. These distinguis.h.i.+ng properties are inseparable from matter, and the phenomena that result, may, in the strictest sense of the word, be said to result necessarily.

If we contemplate a little the paths of Nature--if, for a time, we trace the beings in this Nature, under the different states through which, by reason of their properties, they are compelled to pa.s.s; we shall discover, that it is to motion, and motion only, that is to be ascribed all the changes, all the combinations, all the forms, in short, all the various modifications of matter. That it is by motion every thing that exists is produced, experiences change, expands, and is destroyed. It is motion that alters the aspect of beings; that adds to, or takes away from their properties; which obliges each of them, by a consequence of its nature, after having occupied a certain rank or order, to quit it, to occupy another, and to contribute to the generation, maintenance, and decomposition of other beings, totally different in their bulk, rank, and essence.

In what experimental philosophers have styled the THREE ORDERS OF NATURE, that is to say, the _mineral_, the _vegetable_, and _animal_ worlds, they have established, by the aid of motion, a transmigration, an exchange, a continual circulation in the particles of matter. Nature has occasion in one place, for those particles which, for a time, she has placed in another. These particles, after having, by particular combinations, const.i.tuted beings endued with peculiar essences, with specific properties, with determinate modes of action, dissolve and separate with more or less facility; and combining in a new manner, they form new beings. The attentive observer sees this law execute itself, in a manner more or less prominent, through all the beings by which he is surrounded. He sees nature full of _erratic germe_, some of which expand themselves, whilst others wait until motion has placed them in their proper situation, in suitable wombs or matrices, in the necessary circ.u.mstances, to unfold, to increase, to render them more perceptible by the addition of other substances of matter a.n.a.logous to their primitive being. In all this we see nothing but the effect of motion, necessarily guided, modified, accelerated or slackened, strengthened or weakened, by reason of the various properties that beings successively acquire and lose; which, every moment, infallibly produces alterations in bodies more or less marked. Indeed, these bodies cannot be, strictly speaking, the same in any two successive moments of their existence; they must, every instant, either acquire or lose: in short, they are obliged to undergo continual variations in their essences, in their properties, in their energies, in their ma.s.ses, in their qualities, in their mode of existence.

Animals, after they have been expanded in, and brought out of, the wombs that are suitable to the elements of their machine, enlarge, strengthen, acquire new properties, new energies, new faculties; either by deriving nourishment from plants a.n.a.logous to their being, or by devouring other animals whose substance is suitable to their preservation; that is to say, to repair the continual deperdition or loss of some portion of their own substance, that is disengaging itself every instant. These same animals are nourished, preserved, strengthened, and enlarged, by the aid of air, water, earth, and fire. Deprived of air, or of the fluid that surrounds them, that presses on them, that penetrates them, that gives them their elasticity, they presently cease to live. Water, combined with this air, enters into their whole mechanism of which it facilitates the motion. Earth serves them for a basis, by giving solidity to their texture: it is conveyed by air and water, which carry it to those parts of the body with which it can combine. Fire itself, disguised and enveloped under an infinity of forms, continually received into the animal, procures him heat, continues him in life, renders him capable of exercising his functions. The aliments, charged with these various principles, entering into the stomach, re-establish the nervous system, and restore, by their activity, and the elements which compose them, the machine which begins to languish, to be depressed, by the loss it has sustained. Forthwith the animal experiences a change in his whole system; he has more energy, more activity; he feels more courage; displays more gaiety; he acts, he moves, he thinks, after a different manner; all his faculties are exercised with more ease. This igneous matter, so congenial to generation--so restorative in its effect--so necessary to life, was the JUPITER of the ancients: from all that has preceded, it is clear, that what are called the elements, or primitive parts of matter, variously combined, are, by the agency of motion, continually united to, and a.s.similated with, the substance of animals-- that they visibly modify their being--have an evident influence over their actions, that is to say, upon the motion they undergo, whether visible or concealed.

The same elements, which under certain circ.u.mstances serve to nourish, to strengthen, to maintain the animal, become, under others, the principles of his weakness, the instruments of his dissolution--of his death: they work his destruction, whenever they are not in that just proportion which renders them proper to maintain his existence: thus, when water becomes too abundant in the body of the animal, it enervates him, it relaxes the fibres, and impedes the necessary action of the other elements: thus, fire admitted in excess, excites in him disorderly motion destructive of his machine: thus, air, charged with principles not a.n.a.logous to his mechanism, brings upon him dangerous diseases and contagion. In fine, the aliments modified after certain modes, in the room of nouris.h.i.+ng, destroy the animal, and conduce to his ruin: the animal is preserved no longer than these substances are a.n.a.logous to his system. They ruin him when they want that just equilibrium that renders them suitable to maintain his existence.

Plants that serve to nourish and restore animals are themselves nourished by earth; they expand on its bosom, enlarge and strengthen at its expense, continually receiving into their texture, by their roots and their pores, water, air, and igneous matter: water visibly reanimates them whenever their vegetation or genus of life languishes; it conveys to them those a.n.a.logous principles by which they are enabled to reach perfection: air is requisite to their expansion, and furnishes them with water, earth, and the igneous matter with which it is charged.

By these means they receive more or less of the inflammable matter; the different proportions of these principles, their numerous combinations, from whence result an infinity of properties, a variety of forms, const.i.tute the various families and cla.s.ses into which botanists have distributed plants: it is thus we see the cedar and the hyssop develop their growth; the one rises to the clouds, the other creep humbly on the earth. Thus, by degrees, from an acorn springs the majestic oak, acc.u.mulating, with time, its numerous branches, and overshadowing us with its foliage. Thus, a grain of corn, after having drawn its own nourishment from the juices of the earth, serves, in its turn, for the nourishment of man, into whose system it conveys the elements or principles by which it has been itself expanded, combined, and modified in such a manner, as to render this vegetable proper to a.s.similate and unite with the human frame; that is to say, with the fluids and solids of which it is composed.

The same elements, the same principles, are found in the formation of minerals, as well as in their decomposition, whether natural or artificial. We find that earth, diversely modified, wrought, and combined, serves to increase their bulk, and give them more or less density and gravity. Air and water contribute to make their particles cohere; the igneous matter, or inflammable principle, tinges them with colour, and sometimes plainly indicates its presence, by the brilliant scintillation which motion elicits from them. These stones and metals, these bodies, so compact and solid, are disunited, are destroyed, by the agency of air, water, and fire; which the most ordinary a.n.a.lysis is sufficient to prove, as well as a mult.i.tude of experience, to which our eyes are the daily evidence.

Animals, plants, and minerals, after a lapse of time, give back to Nature; that is to say, to the general ma.s.s of things, to the universal magazine, the elements, or principles, which they have borrowed: The earth retakes that portion of the body of which it formed the basis and the solidity; the air charges itself with these parts, that are, a.n.a.logous to it, and with those particles which are light and subtle; water carries off that which is suitable to liquescency; fire, bursting its chains, disengages itself, and rushes into new combinations with other bodies.

The elementary particles of the animal, being thus dissolved, disunited, and dispersed; a.s.sume new activity, and form new combinations: thus, they serve to nourish, to preserve, or destroy new beings; among others, plants, which arrived at their maturity, nourish and preserve new animals; these in their turn yielding to the same fate as the first.

Such is the constant, the invariable course, of Nature; such is the eternal circle of mutation, which all that exists is obliged to describe. It is thus motion generates, preserves for a time, and successively, destroys, one part of the universe by the other; whilst the sum of existence remains eternally the same. Nature, by its combinations, produces suns, which place themselves in the centre of so many systems: she forms planets, which, by their peculiar essence, gravitate and describe their revolutions round these suns: by degrees the motion is changed altogether, and becomes eccentric: perhaps the day may arrive when these wondrous ma.s.ses will disperse, of which man, in the short s.p.a.ce of his existence, can only have a faint and transient glimpse.

It is clear, then, that the continual motion inherent in matter, changes and destroys all beings; every instant depriving them of some of their properties, to subst.i.tute others: it is motion, which, in thus changing their actual essence, changes also their order, their direction, their tendency, and the laws which regulate their mode of acting and being: from the stone formed in the bowels of the earth, by the intimate combination and close coherence of similar and a.n.a.logous particles, to the sun, that vast reservoir of igneous particles, which sheds torrents of light over the firmament; from the benumbed oyster, to the thoughtful and active man; we see an uninterrupted progression, a perpetual chain of motion and combination; from which is produced, beings that only differ from each other by the variety of their elementary matter--by the numerous combinations of these elements, from whence springs modes of action and existence, diversified to infinity. In generation, in nutrition, in preservation, we see nothing more than matter, variously combined, of which each has its peculiar motion, regulated by fixed and determinate laws, which oblige them to submit to necessary changes. We shall find, in the formation, in the growth, in the instantaneous life, of animals, vegetables, and minerals, nothing but matter; which combining, acc.u.mulating, aggregating, and expanding by degrees, forms beings, who are either feeling, living, vegetating, or else dest.i.tute of these faculties; which, having existed some time under one particular form, are obliged to contribute by their ruin to the production of other forms.

Thus, to speak strictly, nothing in Nature is either born, or dies, according to the common acceptation of those terms. This truth was felt by many of the ancient philosophers. PLATO says, that according to tradition, "the living were born of the dead, the same as the dead did come of the living; and that this is the constant routine of Nature." He adds from himself, "who knows, if to live, be not to die; and if to die, be not to live?" This was the doctrine of PYTHAGORAS, a man of great talent and no less note. EMPEDOCLES a.s.serts, "there is neither birth nor death, for any mortal; but only a combination, and a separation of that which was combined, and that this is what amongst men they call birth, and death." Again he remarks, "those are infants, or short-sighted persons, with very contracted understandings, who imagine any thing is born, which did not exist before, or that any thing can die or perish totally."

CHAP. IV.

_Laws of Motion, common to every Being of Nature.--Attraction and Repulsion.--Inert Force.--Necessity._

Man is never surprised at those effects, of which he thinks he knows the cause; he believes he does know the cause, as soon as he sees them act in an uniform and determinate manner, or when the motion excited is simple: the descent of a stone, that falls by its own peculiar weight, is an object of contemplation to the philosopher only; to whom the mode by which the most immediate causes act, and the most simple motion, are no less impenetrable mysteries than the most complex motion, and the manner by which the most complicated causes give impulse. The uninformed are seldom tempted either to examine the effects which are familiar to them, or to recur to first principles. They think they see nothing in the descent of a stone, which ought to elicit their surprise, or become the object of their research: it requires a NEWTON to feel that the descent of heavy bodies is a phenomenon, worthy his whole, his most serious attention; it requires the sagacity of a profound experimental philosopher, to discover the laws by which heavy bodies fall, by which they communicate to others their peculiar motion. In short, the mind that is most practised in philosophical observation, has frequently the chagrin to find, that the most simple and most common effects escape all his researches, and remain inexplicable to him.

When any extraordinary, any unusual, effect is produced, to which our eyes have not been accustomed; or when we are ignorant of the energies of the cause, the action of which so forcibly strikes our senses, we are tempted to meditate upon it, and take it into our consideration. The European, accustomed to the use of GUNPOWDER, pa.s.ses it by, without thinking much of its extraordinary energies; the workman, who labours to manufacture it, finds nothing marvellous in its properties, because he daily handles the matter that forms its composition. The American, to whom this powder was a stranger, who had never beheld its operation, looked upon it as a divine power, and its energies as supernatural. The uninformed, who are ignorant of the true cause of THUNDER, contemplate it as the instrument of divine vengeance. The experimental philosopher considers it as the effect of the electric matter, which, nevertheless, is itself a cause which he is very far from perfectly understanding.--It required the keen, the penetrating mind of a FRANKLIN, to throw light on the nature of this subtle fluid--to develop the means by which its effects might be rendered harmless--to turn to useful purposes, a phenomenon that made the ignorant tremble--that filled their minds with terror, their hearts with dismay, as indicating the anger of the G.o.ds: impressed with this idea, they prostrated themselves, they sacrificed to JUPITER, to deprecate his wrath.

Be this as it may, whenever we see a cause act, we look upon its effect as natural: when this cause becomes familiar to the sight, when we are accustomed to it, we think we understand it, and its effects surprise us no longer. Whenever any unusual effect is perceived, without our discovering the cause, the mind sets to work, becomes uneasy; this uneasiness increases in proportion to its extent: as soon as it is believed to threaten our preservation, we become completely agitated; we seek after the cause with an earnestness proportioned to our alarm; our perplexity augments in a ratio equivalent to the persuasion we are under: how essentially requisite it is, we should become acquainted with the cause that has affected us in so lively a manner. As it frequently happens that our senses can teach us nothing respecting this cause which so deeply interests us--which we seek with so much ardour, we have recourse to our imagination; this, disturbed with alarm, enervated by fear, becomes a suspicious, a fallacious guide: we create chimeras, fict.i.tious causes, to whom we give the credit, to whom we ascribe the honour of those phenomena by which we have been so much alarmed. It is to this disposition of the human mind that must be attributed, as will be seen in the sequel, the religious errors of man, who, despairing of the capacity to trace the natural causes of those perplexing phenomena to which he was the witness, and sometimes the victim, created in his brain (heated with terror) imaginary causes, which have become to him a source of the most extravagant folly.

In Nature, however, there can be only natural causes and effects; all motion excited in this Nature, follows constant and necessary laws: the natural operations, to the knowledge of which we are competent, of which we are in a capacity to judge, are of themselves sufficient to enable us to discover those which elude our sight; we can at least judge of them by a.n.a.logy. If we study Nature with attention, the modes of action which she displays to our senses will teach us not to be disconcerted by those which she refuses to discover. Those causes which are the most remote from their effects, unquestionably act by intermediate causes; by the aid of these, we can frequently trace out the first. If in the chain of these causes we sometimes meet with obstacles that oppose themselves to our research, we ought to endeavour by patience and diligence to overcome them; when it so happens we cannot surmount the difficulties that occur, we still are never justified in concluding the chain to be broken, or that the cause which acts is SUPER-NATURAL. Let us, then, be content with an honest avowal, that Nature contains resources of which we are ignorant; but never let us subst.i.tute phantoms, fictions, or imaginary causes, senseless terms, for those causes which escape our research; because, by such means we only confirm ourselves in ignorance, impede our enquiries, and obstinately remain in error.

In spite of our ignorance with respect to the meanderings of Nature, (for of the essence of being, of their properties, their elements, their combinations, their proportions, we yet know the simple and general laws, according to which bodies move;) we see clearly, that some of these laws, common to all beings, never contradict themselves; although, on some occasions, they appear to vary, we are frequently competent to discover that the cause becoming complex, from combination with other causes, either impedes or prevents its mode of action being such as in its primitive state we had a right to expect. We know that active, igneous matter, applied to gunpowder, must necessarily cause it to explode: whenever this effect does not follow the combination of the igneous matter with the gunpowder--whenever our senses do not give us evidence of the fact, we are justified in concluding, either that the powder is damp, or that it is united with some other substance that counteracts its explosion. We know that all the actions of man have a tendency to render him happy: whenever, therefore, we see him labouring to injure or destroy himself, it is just to infer that he is moved by some cause opposed to his natural tendency; that he is deceived by some prejudice; that, for want of experience, he is blind to consequences: that he does not see whither his actions will lead him.

If the motion excited in beings was always simple; if their actions did not blend and combine with each other, it would be easy to know, and we should be a.s.sured, in the first instance, of the effect a cause would produce. I know that a stone, when descending, ought to describe a perpendicular: I also know, that if it encounters any other body which changes its course, it is obliged to take an oblique direction, but if its fall be interrupted by several contrary powers, which act upon it alternately, I am no longer competent to determine what line it will describe. It may be a parabola, an ellipsis, spiral, circular, &c. this will depend on the impulse, it receives, and the powers by which it is impelled.

The most complex motion, however, is never more than the result of simple motion combined: therefore as soon as we know the general laws of beings and their action, we have only to decompose, to a.n.a.lyse them, in order to discover those of which they are combined; experience teaches us the effects we are to expect. Thus it is clear, the simplest motion causes that necessary junction of different matter, of which all bodies are composed: that matter, varied in its essence, in its properties, in its combinations, has each its several modes of action or motion, peculiar to itself; the whole motion of a body is consequently the sum total of each particular motion that is combined.

Amongst the matter we behold, some is constantly disposed to unite, whilst other is incapable of union; that which is suitable to unite, forms combinations, more or less intimate, possessing more or less durability: that is to say, with more or less capacity to preserve their union, to resist dissolution. Those bodies which are called SOLIDS, receive into their composition a great number of h.o.m.ogeneous, similar, and a.n.a.logous particles, disposed to unite themselves with energies conspiring or tending to the same point. The primitive beings, or elements of bodies, have need of supports, of props; that is to say, of the presence of each other, for the purpose of preserving themselves; of acquiring consistence or solidity: a truth, which applies with equal uniformity to what is called _physical_, as to what is termed _moral_.

It is upon this disposition in matter and bodies, with relation to each other, that is founded those modes of action which natural philosophers designate by the terms _attraction, repulsion, sympathy, antipathy, affinities, relations_; that moralists describe under the names of _love, hatred, friends.h.i.+p, aversion_. Man, like all the beings in nature, experiences the impulse of attraction and repulsion; the motion excited in him differing from that of other beings, only, because it is more concealed, and frequently so hidden, that neither the causes which excite it, nor their mode of action are known. This system of attraction and repulsion is very ancient, although it required a NEWTON to develop it. That love, to which the ancients attributed the unfolding, or disentanglement of chaos, appears to have been nothing more than a personification of the principle of attraction. All their allegories and fables upon chaos, evidently indicate nothing more than the accord or union that exists between a.n.a.logous and h.o.m.ogeneous substances; from whence resulted the existence of the universe: whilst discord or repulsion, which they called SOIS, was the cause of dissolution, confusion, and disorder; there can scarcely remain a doubt, but this was the origin of the doctrines of the TWO PRINCIPLES. According to DIOGENES LAERTIUS, the philosopher, EMPEDOCLES, a.s.serted, that "_there is a kind of affection by which the elements unite themselves; and a sort of discord, by which they separate or remove themselves._"

However it may be, it is sufficient for us to know that by an invariable law, certain bodies are disposed to unite with more or less facility; whilst others cannot combine or unite themselves: water combines itself readily with salt, but will not blend with oil. Some combinations are very strong, cohering with great force, as metals; others are extremely feeble, their cohesion slight and easily decomposed, as in fugitive colours. Some bodies, incapable of uniting by themselves, become susceptible of union by the agency of other bodies, which serve for common bonds or MEDIUMS. Thus, oil and water, naturally heterogeneous, combine and make soap, by the intervention of alkaline salt. From matter diversely combined, in proportions varied almost to infinity, result all physical and moral bodies; the properties and qualities of which are essentially different, with modes of action more or less complex: which are either understood with facility, or difficult of comprehension, according to the elements or matter that has entered into their composition, and the various modifications this matter has undergone.

It is thus, from the reciprocity of their attraction, the primitive imperceptible particles of matter, which const.i.tute bodies, become perceptible, form compound substances, aggregate ma.s.ses; by the union of similar and a.n.a.logous matter, whose essences fit them to cohere. The same bodies are dissolved, their union broken, whenever they undergo the action of matter inimical to their junction. Thus by degrees are formed, plants, metals, animals, men; each grows, expands, and increases in its own system or order; sustaining itself in its respective existence, by the continual attraction of a.n.a.logous matter; to which it becomes united, and by which it is preserved and strengthened. Thus, certain aliments become fit for the sustenance of man, whilst others destroy his existence: some are pleasant to him, strengthen his habit; others are repugnant to him, weaken his system: in short, never to separate physical from moral laws, it is thus that men, mutually attracted to each other by their reciprocal wants, form those unions which we designate by the terms, MARRIAGE, FAMILIES, SOCIETIES, FRIENDs.h.i.+PS, CONNEXIONS: it is thus that virtue strengthens and consolidates them; that vice relaxes or totally dissolves them.

Of whatever nature may be the combination of beings, their motion has always one direction or tendency: without direction we could not have any idea of motion: this direction is regulated by the properties of each being; as soon as they have any given properties, they necessarily act in obedience to them: that is to say, they follow the law invariably determined by these same properties; which, of themselves, const.i.tute the being such as he is found, and settle his mode of action, which is always the consequence of his manner of existence. But what is the general direction, or common tendency, we see in all beings? What is the visible and known end of all their motion? It is to conserve their actual existence--to preserve themselves--to strengthen their several bodies--to attract that which is favorable to them--to repel that which is injurious them--to avoid that which can harm them--to resist impulsions contrary to their manner of existence, and to their natural tendency.

To exist, is to experience the motion peculiar to a determinate essence: to conserve this existence, is to give and receive that motion from which results its maintenance:--it is to attract matter suitable to corroborate its being--to avoid that by which it may be either endangered or enfeebled. Thus, all beings of which we have any knowledge, have a tendency to conserve themselves, each after its peculiar manner: the stone, by the firm adhesion of its particles, opposes resistance to its destruction. Organized beings conserve themselves by more complicated means, but which are, nevertheless, calculated to maintain their existence against that by which it may be injured. Man, both in his physical and in his moral capacity, is a living, feeling, thinking, active being; who, every instant of his duration, strives equally to avoid that which may be injurious, and to procure that which is pleasing to him, or that which is suitable to his mode of existence; all his actions tending solely to conserve himself.