Catholic Churchmen in Science Part 8

On taking the crystal home, Hauy proceeded further to break up the smaller fragment; and he soon found that he could remove slice after slice of it, until there was no trace of the original prism, but in place of it a rhomboid, {179} perfectly similar to Iceland spar, and lying in the middle of what was the original prism. This fact seemed to him very important. From it he began the development of a theory of crystallization, using this observation as the key. Before this time it had been hard for students of mineralogy to understand how it was that substances of the same composition might yet have what seemed to be different crystalline forms. Calcspar, for instance, might be found crystallized in forms, apparently, quite at variance with one another.

By his studies, however, Hauy was able to determine that whenever substances of the same composition crystallized, even though the external form of the crystals seemed to be different, all of them were found to have the same internal nucleus. Whenever the mineral under observation was chemically different from another, then the nucleus also had a distinctive character; and so there came the law that all substances of the same kind crystallized in the same way, notwithstanding apparent differences. Indeed, one of the first results of this law was the recognition of the fact that when the crystalline forms of two minerals were essentially different, then, no matter how similar they might be, there was sure to be some chemical difference.

This enabled Hauy to make certain prophecies with regard to the composition of minerals.

A number of different kinds of crystals had been cla.s.sed together under the name of {180} heavyspar. Some of these could not, by the splitting process, be made to produce _nuclei_ of similar forms, and the angles of the crystals were quite different. Hauy insisted that, in spite of close resemblances, there was an essential distinction in the chemical composition of these two different crystalline formations; and before long careful investigation showed that, while many of the specimens called heavyspar contain barium, some of them contain a new substance--strontium--which had been very little studied heretofore. This principle did not prove to be absolute in its application; but the amount of truth in it attracted attention to the subject of crystallography because of the help which that science would afford in the easy recognition of the general chemical composition of mineral substances. The most important part of Hauy's work was the annunciation of the law of symmetry. He emphasized the fact that the forms of crystals are not irregular or capricious, but are very constant and definite, and founded on absolutely fixed and ascertainable laws. He even showed that, while from certain crystalline nuclei sundry secondary forms may be derived, there are other forms that cannot by any possibility occur. Any change of crystalline form noticed in his experiments led to a corresponding change along all similar parts of the crystal. The angles, the edges, the faces, were modified in the same way, at the same time. All these elements of mensuration within the crystal Hauy thought could be indicated by rational coefficients.

{181}

Crystallography, however, did not absorb all Hauy's attention. He further demonstrated his intellectual power by following out other important lines of investigation that had been suggested by his study of crystals. It is to him more than to any other, for instance, that is due the first steps in our knowledge of pyro-(or thermo-) electricity. Mr. George Chrystal, professor of mathematics at the University of St. Andrews, in the article on electricity written for the ninth edition of the Encyclopedia, says it was reserved for the Abbe Hauy in his Treatise on Mineralogy to throw a clear light on this curious branch of the science of electricity.

To those who are familiar with the history of the development of this science it will be no surprise to find a clergyman playing a prominent role in its development. During the days of the beginning of electricity many ecclesiastics seem to have been particularly interested in the curious ways of electrical phenomena, and as a consequence they are the original discoverers of some of the most important early advances. Not long before this, Professor Gordon, a Scotch Benedictine monk who was teaching at the University of Erfurt, constructed the first practical electrical machine. Kleist, who is one of the three men to whom is attributed the discovery of the principle of storing and concentrating electricity, and who invented the Leyden Jar, which was named after the town where it was first manufactured, was also a member of a Religious Order. As {182} we have already stated, Dirwisch, the Premonstratensian monk, set up a lightning-conductor by which he obtained sparks from the clouds even before our own Franklin.

Abbe Hauy was only following a very common precedent, then, when he succeeded by his original research in setting the science of pyro-electricity firmly on its feet. It is true, others before him had noted that substances like tourmaline possessed electrical properties.

There is even some good reason for thinking that the _lyncurium_ of the ancients which, according to certain of the Greek philosophers, especially Theophrastus, who seems to have made a close study of the subject, attracted light bodies, was really our modern tourmaline. In modern times the Dutch found this mineral in Ceylon and, because it attracted ashes and other light substances to itself, called it _aschentriker_--that is, attractor of ashes. Others had still further experimented with this curious substance and its interesting electrical phenomena. It remained for Abbe Hauy, however, to demonstrate the scientific properties of tourmaline and the relations which its electrical phenomena bore toward the crystalline structure of the mineral. He showed that the electricity of tourmaline decreases rapidly from the summits or poles toward the middle of the crystal. As a matter of fact, at the middle of the crystal its electrical power becomes imperceptible.

He showed also that each particle of a crystal {183} that exhibits pyro-electricity is itself a source of the same sort of electricity and exhibits polarity. His experimental observations served to prove also that the pyro-electric state has an important connexion with the want of symmetry in the crystals of the substances that exhibit this curious property. In tourmaline, for instance, he found the vitreous charge always at the summit of the crystal which had six faces, and the resinous electricity at the summit of the crystal with three faces.

His experiments soon showed him, too, that there were a number of other substances, besides tourmaline, which possessed this same electrical property when subjected to heat in the crystalline stage.

Among these were the Siberian and Brazilian topaz, borate of magnesia, mesotype, sphene, and calamine. In all of these other pyro-electrical crystals, Hauy detected a corresponding deviation from the rules of symmetry in their secondary crystals to that which occurs in tourmaline. In a word, after he had concluded his experiments and observations there was very little left for others to add to this branch of science, although such distinguished men as Sir David Brewster in England were among his successors in the study of the peculiar phenomena of pyro-electricity.

It may naturally enough be thought that, born in the country, of poor parents, and compelled to work for his living, Hauy would at least have the advantage of rugged health to help him in his {184} career.

He had been a delicate child, however; and his physical condition never improved to such an extent as to inure him to hards.h.i.+ps of any kind. One of his biographers has gone so far as to say that his life was one long malady. The only distraction from his almost constant suffering was his studies. Yet this man lived to be nearly eighty years of age, and accomplished an amount of work that might well be envied even by the hardiest.

In the midst of his magnificent success as a scientist, Hauy was faithful to all his obligations as a priest. His name was known throughout Europe, and many of the scientific societies had considered that they were honoring themselves by conferring t.i.tles, or degrees, upon him; but he continued to be the humble, simple student that he had always been.

At the beginning of the Revolution, Abbe Hauy was among the priests who refused the oath which the Republican government insisted on their taking, and which so many of them considered derogatory to their duty as churchmen. Those who refused were thrown into prison, Hauy among them. He did not seem to mind his incarceration much, but he was not a little perturbed by the fact that the officers who made the arrest insisted on taking his precious papers, and that his crystals were all tossed aside and many of them broken. For some time he was kept in confinement with a number of other members of the faculty of the University, mainly {185} clergymen, in the Seminary of St. Firmin, which had been turned into a temporary jail.

Hauy did not allow his studies to be entirely interrupted by his imprisonment. He succeeded in obtaining permission to have his cabinets of crystals brought to his cell, and he continued his investigation of them. It was not long before powerful friends, and especially his scientific colleague, Gregory St. Hilaire, interested themselves in his case, and succeeded in obtaining his liberation.

When the order for his release came, however, Hauy was engaged on a very interesting problem in crystallography, and he refused to interrupt his work and leave the prison. It was only after considerable persuasion that he consented to go the next morning. It may be added that only two weeks later many from this same prison were sent to the guillotine.

It is rather remarkable that the Revolutionary government, after his release, did not disturb him in any way. He was so much occupied with his scientific pursuits that he seems to have been considered absolutely incapable of antagonizing the government; and, as he had no enemies, he was not denounced to the Convention. This was fortunate, because it enabled him to pursue his studies in peace. There was many another member of the faculty of the University who had not the same good fortune. Lavoisier was thrown into prison, and, in spite of all the influence that could be brought to bear, the great discoverer of oxygen met his death by the guillotine. At least {186} two others of the professors in the physical department, Borda and De Lambre, were dismissed from their posts. Hauy, though himself a priest who had refused to take the oath, and though he continued to exercise his religious functions, did not hesitate to formulate pet.i.tions for his imprisoned scientific friends; yet, because of his well-known gentleness of character, this did not result in arousing the enmity of any members of the government, or attracting such odious attention as might have made his religious and scientific work extremely difficult or even prevented it entirely.

Notwithstanding the stormy times of the French Revolution and the stirring events going on all round him in Paris, Hauy continued to study his crystals in order to complete his observations; and then he embodied his investigations and his theories in his famous "Treatise on Crystallography." This attracted attention not only on account of the evident novelty of the subject, but more especially because of the very thorough method with which Hauy had accomplished his work. His style, says the historian of crystallography, was "perspicuous and elegant. The volume itself was noteworthy for its clear arrangement and full ill.u.s.tration by figures." In spite of its deficiencies, then deficiencies which must exist in any ground-breaking work--this monograph has had an enduring influence. Some of the most serious flaws in his theory were soon brought to light because of the very stimulus afforded by his investigations.

{187}

As to the real value of his treatise, perhaps no better estimate can be formed than that given by Cuvier in his collection of historical eulogies (Vol. III, p. 155): "In possession of a large collection, to which there flowed from all sides the most varied minerals, arranged with the a.s.sistance of young, enthusiastic, and progressive students, it was not long before there was given back to Hauy the time which he had apparently wasted over other things. In a few years he raised up a wondrous monument, which brought as much glory to France as it did somewhat later to himself. After centuries of neglect, his country at one bound found itself in the first rank in this department of natural science. In Hauy's book are united in the highest degree two qualities which are seldom a.s.sociated. One of these is that it was founded on an original discovery which had sprung entirely from the genius of its author; and the other is that this discovery is pursued and developed with almost unheard-of persistence down even to the least important mineral variety. Everything in the work is great, both as regards conception and detail. It is as complete as the theory it announces."

It was not surprising, then, that, after the death of Professor Dolomieu, Hauy should be raised to the chair of mineralogy and made director of that department in the Paris Museum of Natural History.

Here he was to have new triumphs. We have already said that his book was noted for the elegance of its style and its perspicuity. {188} As the result of this absolute clearness of ideas, and completeness and simplicity of expression, Hauy attracted to him a large number of pupils. Moreover, all those interested in the science, when they came in contact with him, were so charmed by his grace and simplicity of manner that they were very glad to attend his lectures and to be considered as his personal friends. Among his listeners were often such men as La Place, Berthollet, Fourcroy, Lagrange and Lavoisier.

It was not long before honors of all kinds, degrees from universities and members.h.i.+ps in scientific societies all over Europe, began to be heaped upon Hauy. They did not, however, cause any change in the manners or mode of life of the simple professor of old times. Every day he continued to take his little walks through the city, and was very glad to have opportunity to be of a.s.sistance to others. He showed strangers the way to points of interest for which they inquired, whenever it was necessary, obtained entrance cards for them to the collection; and not a few of those who were thus enabled to take advantage of his kindness failed to realize who the distinguished man was to whom they owed their opportunities. His old-fas.h.i.+oned clothing still continued to be quite good enough for him, and his modest demeanor and simple speech did not betray in any way the distinguished scientist he had become.

Some idea of the consideration in which the {189} Abbe Hauy was held by his contemporaries may be gathered from the fact that several of the reigning monarchs of Europe, as well as the heirs apparent to many thrones, came at some time or other to visit him, to see his collection, and to hear the kindly old man talk on his hobby. There was only one other scientist in the nineteenth century--and that was Pasteur, toward the end of it--who attracted as much attention from royalty. Among Hauy's visitors were the King of Prussia, the Emperor of Austria, the Archduke John, as well as the Emperor of Russia and his two brothers, Nicholas and Michael, the first of whom succeeded his elder brother, Alexander, to the throne, and half a century later was ruling Russia during the Crimean War. The Prince Royal of Denmark spent a portion of each year for several years with Hauy, being one of his intimates, who was admitted to his room while he was confined to his bed, and who was permitted to share his personal investigations and scientific studies.

His most striking characteristic was his suavity toward all. The humblest of his students was as sure to receive a kindly reception from him, and to have his difficulties solved with as much patience as the most distinguished professor in this department. It was said that he had students of all cla.s.ses. The attendants at the normal school were invited to visit him at his house, and he permitted them to learn all his secrets. When they came to him for a whole {190} day, he insisted on taking part in their games, and allowed them to go home only after they had taken supper with him. All of them looked upon him as a personal friend, and some of them were more confidential with him than with their nearest relatives. Many a young man in Paris during the troublous times of the Revolutionary period found in the good Abbe Hauy not only a kind friend, but a wise director and another father.

It is said that one day, when taking his usual walk, he came upon two former soldiers who were just preparing to fight a duel and were on their way to the dueling ground. He succeeded in getting them to tell him the cause of their quarrel, and after a time tempted them to come with him into what I fear we should call at the present day a saloon.

Here, over a gla.s.s of wine, he finally persuaded them to make peace and seal it effectually. It is hard to reconcile this absolute simplicity of character and kindness of heart with what is sometimes a.s.sumed to be the typical, distant, abstracted, self-centered ways of the great scientist.

Few men have had so many proofs of the lofty appreciation of great contemporaries. Many incidents serve to show how much Napoleon thought of the distinguished scholar who had created a new department of science and attracted the attention of the world to his splendid work at Paris. Not long after he became emperor, Napoleon named him Honorary Canon of the {191} Cathedral of Notre Dame; and when he founded the Legion of Honor, he made the Abbe one of the original members. Shortly after these dignities had been conferred upon him, it happened that the Abbe fell ill; and Napoleon, having sent his own physician to him, went personally to call on him in his humble quarters, saying to the physician: "Remember that you must cure Abbe Hauy, and restore him to us as one of the glories of our reign." After Napoleon's return from Elba, he told the Abbe that the latter's "Treatise on Crystallography" was one of the books that he had specially selected to take with him to Elba, to while away the leisure that he thought he would have for many years. Abbe Hauy's independence of spirit, and his unselfish devotion to his native country, may be best appreciated from the tradition that after the return from Elba, when there was a popular vote for the confirmation of Napoleon's second usurpation, the old scientist voted, No.

In spite of his constant labor at his investigations, his uniformly regular life enabled him to maintain his health, and he lived to the ripe age of over seventy-nine. Toward the end of his career, he did not obtain the recognition that his labors deserved. After the Restoration, he was not in favor with the new authorities in France, and he accordingly lost his position as professor at the University.

The absolute simplicity of life that he had always maintained now stood him in good stead; and, notwithstanding the {192} smallness of his income, he did not have to make any change in his ordinary routine. Unfortunately, an accidental fall in his room at the beginning of his eightieth year confined him to his bed; and then his health began to fail very seriously. He died on the 3 June, 1822.

He had shown during his illness the same gentleness and humility, and even enthusiasm for study whenever it was possible, that had always characterized him. While he was confined to his bed he divided his time between prayer, attention to the new edition of his works which was about to appear, and his interest for the future of those students who had helped him in his investigations. Cuvier says of him that "he was as faithful to his religious duties as he was in the pursuit of his studies. The profoundest speculations with regard to weighty matters of science had not kept him from the least important duty which ecclesiastical regulations might require of him." There is, perhaps, no life in all the history of science which shows so clearly how absolutely untrue is the declaration so often made, that there is essential opposition between the intellectual disposition of the inquiring scientist and those other mental qualities which are necessary to enable the Christian to bow humbly before the mysteries of religion, acknowledge all that is beyond understanding in what has been revealed, and observe faithfully all the duties that flow from such belief.

{193}

VIII.

ABBOT MENDEL: A NEW OUTLOOK IN HEREDITY.

There is grandeur in this view of life, with its several powers having been originally breathed by the Creator into a few forms or into one; and that, while this planet has gone circling on according to the fixed law of gravity from so simple a beginning, endless forms, most beautiful and most wonderful, have been and are being evolved.-- Closing sentence of DARWIN'S _Origin of Species_.

{194}

[Ill.u.s.tration: GREGOR MENDEL]

{195}

VIII.

ABBOT MENDEL, [Footnote 14]: A NEW, OUTLOOK IN HEREDITY.

[Footnote 14: The portrait of Abbot Mendel which precedes this sketch was kindly furnished by the Vicar of the Augustinian Monastery of Brunn. It represents him holding a fuchsia, his favorite flower, and was taken in 1867, just as he was completing the researches which were a generation later to make his name so famous. The portrait has for this reason a very special interest as a human doc.u.ment. We may add that the sketch of Abbot Mendel which appears here was read by the Very Rev. Klemens Janetschek, the Vicar of the Monastery, who suggested one slight change in it, so that it may be said to have had the revision of one who knew him and his environment very well.]

Scientific progress does not run in cycles of centuries, and as a rule it bears no relations.h.i.+p to the conventional arrangement of years. As has been well said--for science a new century begins every second.

There are interesting coincidences, however, of epoch-making discoveries in science corresponding with the beginning of definite eras in time that are at least impressive from a mnemonic standpoint, if from no other.

The very eve of the nineteenth century saw the first definite formulation of the theory of evolution. Lamarck, the distinguished French biologist, stated a theory of development in nature which, although it attracted very little attention {196} for many years after its publication, has come in our day to be recognized as the most suggestive advance in biology in modern times.

As we begin the twentieth century, the most interesting question in biology is undoubtedly that of heredity. Just at the dawn of the century three distinguished scientists, working in different countries, rediscovered a law with regard to heredity which promises to be even more important for the science of biology in the twentieth century than was Lamarck's work for the nineteenth century. This law, which, it is thought, will do more to simplify the problems of heredity than all the observations and theories of nineteenth-century workers, and which has already done much more to point out the methods by which observation, and the lines along which experimentation shall be best directed so as to replace elaborate but untrustworthy scientific theorizing by definite knowledge, was discovered by a member of a small religious community in the little-known town of Brunn, in Austria, some thirty-five years before the beginning of the present century.

Considering how generally, in English-speaking countries at least, it is supposed that the training of a clergyman and particularly that of a religious unfits him for any such initiative in science, Father Mendel's discovery comes with all the more emphatic surprise. There is no doubt, however, in the minds of many of the most prominent present-day workers in biology that his {197} discoveries are of a ground-breaking character that will furnish substantial foundation for a new development of scientific knowledge with regard to heredity.

Lest it should be thought that perhaps there is a tendency to make Father Mendel's discovery appear more important here than it really is, because of his station in life, it seems desirable to quote some recent authoritative expressions of opinion with regard to the value of his observations and the importance of the law he enunciated, as well as the principle which he considered to be the explanation of that law.

In the February number of _Harper's Monthly_ for 1903, Professor Thomas Hunt Morgan, Professor of Biology at Bryn Mawr, and one of the best known of our American biologists, whose recent work on "Regeneration" has attracted favorable notice all over the world, calls attention to the revolutionary character of Mendel's discovery.

He considers that recent demonstrations of the mathematical truth of Mendel's Law absolutely confirm Mendel's original observations, and the movement thus initiated, in Professor Morgan's eyes, gives the final _coup de grace_ to the theory of natural selection. "If," he says, "we reject Darwin's theory of natural selection as an explanation of evolution, we have at least a new and promising outlook in another direction and are in a position to answer the oft-heard but unscientific query of those who must cling to some dogma: if you reject Darwin, what better have you to offer?"

{198}