My Tropic Isle Part 7

In spite of the greater activity and muscular power of the lizard, the combat seemed unfair, for in the cunning persistency of the frail but determined little snake there was something uncanny and nerve-shaking.

For fully ten minutes the fight continued. The violent antics of the lizard became less and less frequent. Obviously the tactics of the snake were wearing it down. Though the lizard seemed to have lost none of its spirit, the flesh was becoming weak. While it panted, its eyes twinkled with inane ferocity, and the snake, with that peculiar fearsome, gliding movement--neither wriggle nor squirm--typical of the species, slowly edged its victim under the shadow of a tussock. There both reposed, the snake calm in craft and design, the lizard waiting for the one chance of its life. Swallowing the lizard under any circ.u.mstances seemed an impossible feat. To begin the act in the middle of the body was absolutely beyond accomplishment. There would come a time when the death-adder must release its hold to re-seize its prey by the head or tail, and if the soul of the lizard could possess itself in patience until that moment, and take advantage of it, all might be well.

Now, it seemed to me, the only witness to this fateful fray, that both parties to it knew that the crisis had yet to come. The lizard reserved all its energy for a supreme effort--for one leap to liberty and life--while its impa.s.sive foe stolidly concentrated its powers in the direction of an instantaneous release and a fresh grip at a convenient part. Thus they lay. A thrill of excitement possessed me as I watched.

The flas.h.i.+ng alertness of a fly-catching lizard, is it not proverbial?

Which was to be the master--the more muscular creature with four legs, the whole previous existence of which had depended upon its agility, or the subtle, slow, snake, which moves under ordinary circ.u.mstances not very much faster than a clammy worm? As I watched with all possible keenness a grey blur followed by bewildering wrigglings and contortions indicated a new manoeuvre. Then instead of two reptiles at right angles, there appeared to be but one, and with a tail at each end. The head of the lizard was in the jaws of the death-adder. The fatal quickness of the snake had decided the combat.

But the lizard was not yet resigned to its fate. It rolled and reared and wriggled, tossing and tumbling the adder; but all in vain.

Alas! light-hearted lizard, servant and trustful companion of man, thou art joined in woeful issue! There can be no deliverance for thy jewelled head from that slow, all-absorbing chancery! No striving, no pus.h.i.+ng with frenzied fingers, no las.h.i.+ng with that whip-like tail may now avail.

Never more may you bask and blink in the glare, or doze in the knife-edged shadows, or pounce upon gauze-winged flies. Thou hast learned too late that snakes, like democracy, never restore anything.

I waited for the finish, which came with painful slowness. The sides of the victim heaved and quivered even as they slowly disappeared and the end of that once foppish tail twitched sadly as it hung limply from the jaws of the gorged snake.

Although it had practically demonstrated that the lesser can contain the greater, the snake was but triflingly increased in girth. It was just in that phenomenal condition which ent.i.tled it to the honour of preservation in a solution of formalin.

CHAPTER XII

SEA-WORMS AND SEA-CUc.u.mBERS

From the tinted tips of fragile corals to the ooze on the edge of the beach sand there is seething life. Exposed by the ebb tide, the sun-caressed slime glitters and s.h.i.+mmers, so that if the observer is content to stand still for a few moments he shall see myriads of obscure activities, graceful and uncouth, of the existence of which he has not previously dreamt and among which his footsteps make a desolating track. Perhaps in no other earthly scene do the gradations of life blend so obviously in form and appearance. This mud is primal, fertile with primitives, for similitude of environment checks variations.

In such tepid slime primordial life began, and in it even in these latter days the far beginning of superior things may be discovered actively pursuing their craft and purpose in the order of the universe. Worms are abundant, and among them certain genera which might be taken as apt ill.u.s.trations of the more significant facts of evolution. Studying them, the parting of the ways between two distinct orders, each having a conspicuous feature in common while differing in appearance and habits generally, is made strangely plain, and I propose in my unversed way to demonstrate the line of upward development in a few examples.

Accepting as a primitive form that deplorably thin, phantasmal worm which excavates in the ooze an appropriately narrow shaft indicated by a dimple, or, in some cases, a swelling mound with a well-defined crater and circular pipe, the ascent of the genealogical tree is not beset with any great difficulty. These worms are grey in colour and shoddy in texture, merely a tough description of slime with a crude head and long, simple filaments. The sides of the shafts are smooth, and on the least alarm the nervous inhabitant retracts with surprising alertness. Slightly superior in grade, but in uninterrupted succession, is a similar worm which solidifies its shaft with a kind of mortar and carries it up above the level of the ooze about an inch or so--a crude effort in the direction of the acquirement of some ease of circ.u.mstance. These flue-like projections are more frequent on the verge of the sandy beach.

The next in order--still slim, though of a slightly more robust habit of body--has acquired the art of spinning (caterpillar-like) a coc.o.o.n, and of causing to adhere to the exterior thereof grains of sand and minute chips of sh.e.l.l. Though this vestlet is very frail and though the sandy outer coat is liable to drop off (when it collapses altogether), it seems to me to indicate distinct progress, a successful accomplishment in the direction of isolation, independence, and security. Does it not signify that the animal has a certain perception of the knowledge of good and evil such as dawned upon Eve as she ate the diverting apple? Eve forthwith took to fig-leaves; the slim worm knitted a shoddy wrapper and reinforced it with grains of sand when it realised that there was something better than slush for a dwelling. The sandy coverlet is evidence of the gift of discrimination.

A still more highly endowed relation spins a similar fabric, upon which are loosely agglutinated numbers of small dead sh.e.l.ls, grit, and even opercula a quarter of an inch in diameter. In weight, size, and number of its const.i.tuents this exterior armour is altogether disproportionate to the extreme tenuity of its foundation. Too unsubstantial to sustain its own weight, it sprawls, like the track of a tipsy snail, indeterminately, slowly developing its sinuosities over the irregular surface of a rock, and slightly adherent thereto, throughout its whole length. Of this there seem to be several nicely shaded grades, some in the form of galleries laboriously built of a mixture of mud and sand, and each indicating superiority to the naked denizen of the clement mud. They seem to be superior in appearances also, for some of the animals display brightly coloured plume-like tentacles, long and capable of being ostentatiously fluttered.

The individual worm next to be described typifies such a wonderful advance that it might almost be designated a subsequent and intrusive sport, no marked are the distinctions it exhibits. It is one of the sh.e.l.l-binders (PECTINARIA), but its mansion of mosaics is unique and beautiful. In the universal struggle for place, self-preservation, and food, the animal has acquired a higher order of intelligence and keener perceptions of safety and of the niceties of life than its fellows.

Living in sand and mud, in obedience to some gracious instinct, it gathers numbers of small sh.e.l.ls, grit, and fragments of coral wherewith to construct a tube, somewhat similar in shape to the horn of cornucopia, and from three to six inches long. The materials are cemented together in accordance with a symmetrical design, the interior being lined with a transparent substance, which, when dry, is readily separable from the casing! This creature accomplishes by calculation, choice, and dexterity that which a subtle chemical process does unconsciously for the more advanced mollusc, and that it practised the art of the interlocking of atoms ages before the birth of Macadam can scarcely be doubted.

My imagination loves to dwell on the perceptive faculties possessed by this lowly creature, a creature soft and delicate, merely such and such a length of gelatinous substance, slightly stiffened and toughened and graced with a pair of tentacles glittering like tinsel extended from a marvellously constructed tube.

In certain structural details the animal (which in appearance has greater resemblance to a caterpillar than a worm) is even more remarkable than the ornate dwelling it constructs, for it is an actual though living prototype of the fabled race (catalogued by Oth.e.l.lo with the anthropophagi)--

"Whose heads Do grow beneath their shoulders."

The paradox exists, not as a whim or grimace on the part of Nature but for a definite and vital end. In default the animal would be unable to obey the first law of Nature--self preservation--for it is soft-bodied and its dwelling has the serious defect of being open at both ends. In such plight lacking special organs it would be at cruel advantage in the struggle for existence. The posterior segment of the body is therefore developed into an operculum-like organ, smooth and of h.o.r.n.y texture, which closes the narrow end of the tube. The other extremity is more elaborately guarded, the anterior segment being fringed with a frontal membrane, while the second segment forms a disc, the minute mouth orifice with the true tentacles and gills being debased to the third segment.

Confronted by danger, the animal closes its front door by retracting until the disc presses immovably against the circ.u.mference of the tube, the retraction being so sudden that a frail spurt betrays the whereabouts of an otherwise secret dwelling-place. In the centre of the disc is the first segment, from which the frontal fringe is extended in the form of an array of keen bristles as a defensive weapon. With the lid at one end and the armed disc at the other the animal enjoys security and comfort, and when unsuspicious the "shoulders" protrude, the head meekly following. The tentacles are serrate and glitter like tinsel, possibly for the fascination of the minute forms of life which the tube-dweller consumes. To enable it to retract and emerge quickly the animal is provided with a series of tufts of bristles on the back and on the ventral surface of the body with a row of toothed "pads," which fulfil the dual office of grapplers and feet.

With what skill and patience does this pectinarian construct its ornate habitation! How artfully does it pick and choose among the tiny sh.e.l.ls and grit! With what rare discretion rejects the unfit, and with what satisfaction retains a neat and dainty item of building material! How deftly does it arrange its courses and bonds, cementing each fragment in its place until a perfect cylinder, proportionate in dimensions, uniformly expanding in circ.u.mference, smooth within, rugged without, scientifically correct in design, is the result! How apt, too, the frictionless lining! And all this laborious neatness and precision absorbed in the construction of a tenement which has no time! Does the inmate possess any sense of duration? Addison (quoting a French authority) says that it is possible some creatures may think half an hour as long as we do a thousand years! The magnificent mind of the modern biologist regards a million of years as a mere f.a.g-end of time. The industrious worm which has built so choice a home may have enjoyed the sense of comfort and security for a period representing an honourable age, while, according to the standards of man, the home was not worth the building for so short a tenancy.

Do we not see in this astonis.h.i.+ng example a highly successful effort of a marine worm to improve on the condition and habits of its barbarous ancestors? a.n.a.lyse a bulk sample of the building material, and you shall find it not dissimilar from the sh.e.l.l of a mollusc, and the interior film--no doubt a secretion of the animal--is to be safely accepted as a.n.a.logous to the silky smoothness which molluscs (often of rough and rugged exterior) obtain by nacreous deposit and which finds its culmination in the goldlip mother-of-pearl?

Still higher in the series, so far as the construction of a tenement is concerned, is that known as the SERPULA, a worm which constructs a calcareous tube more or less loosely convoluted and adherent to a sh.e.l.l or stone or coral, or sometimes entwined into a self-supporting colony.

Another worm builds of sand or mud, with a rough casting of fine gravel and sh.e.l.l-grit, a habitation similar in design to that of the serpula, though on a less complete and authoritative model; indeed, it would almost seem that the latter had designed its tenement after the fas.h.i.+on of that of its poor relation--that the one made a study in mud which the other reproduced in carbonate of lime. But the most curious fact is that a true mollusc (VERMETUS) so far departs from the fas.h.i.+on prevalent in the molluscan world of building a spiral sh.e.l.l, that after beginning one in proper spiral mode it elongates itself in vermiform manner and forms an irregular serpuloid tube on the surface of larger sh.e.l.ls or stones just as the SERPULA does; so that without examination of the animal one may easily be mistaken for the other.

What a contrast is here--on the one hand a lowly worm learning to build a solid if rude sh.e.l.ly covering for its tender body, on the other a relative of the elegant, many-whorled TURRITELLA forgetting its high station and degenerating to the likeness of a worm. No doubt it is really a case of degeneration from the acquirement of fixed habits, just as when a lively young crustacean larva gives up its free independent life and glues its head to a stone--what happens? Why, he becomes a mere barnacle instead of a spritely shrimp as he might have been! Let mankind take note and beware.

Another group of worm-like or snaky creatures common on a coral-reef are the sea-cuc.u.mbers or beche-de-mer. In my experience the most singular branch of the family is at once the longest and thinnest, for it resembles a snake so closely that at first sight the observer subconsciously a.s.sumes an att.i.tude of hostility. There seem to be two varieties of the species. One is much more ruddy in appearance than the other, and its body is the smoother; but they are much alike in physique and helplessness. The figure of a sausage-skin four or five and even six feet long, and capable of elongation to almost double, containing muddy water in circulation and one end exhibiting a set of ever-waving tentacles, conveys a not unflattering notion of the animal as it lies coiled among the coral, half hidden with algae. Far too feeble to be offensive, it suffers collapse on alarm--that is to say, if such a violent mental and physical ill can befall an animal of such crude organism. At least, the tentacles are withdrawn, nor will they be protruded until some sense--unlikely to be either sight, hearing, taste, or touch, but probably nervous tension acutely susceptible to vibrations--tells that danger is past. Then the tentacles are shyly exhibited and the agitations of the animal are renewed.

Throughout the length of the body of the more remarkable of the two species of which I may speak on first-hand knowledge are four rows of bosses, closely s.p.a.ced, which when the animal has dragged its slow length along to the utmost limit diminish into mere wrinkles, and disappear altogether when it is slung across a stick, and the fluid contents, being precipitated, congest and woefully weight each end, sometimes to the bursting-point. The bosses of repose seem to indicate so much length in reserve. A dozen simple tentacles, sword-shaped, with frayed edges, and about an inch and a half long, indicate the head without decorating it, for they are of an inconspicuous neutral tint, closely resembling the alga among which the animal slowly winds its way.

The progress of all species of beche-de-mer is sedate and cautious, and this, probably the longest and the weakest and limpest of all, surpa.s.ses the race in deliberateness. It cannot move as a whole, so it progresses in sections. When the head has been advanced to its utmost, about the middle of the body an independent series of succeedant ripples or wrinkles manifests itself and travels consistently ahead, while farther towards the rear another series follows, and so on, until the lagging tail is enabled to wrinkle itself along. But the animal is endowed with the capacity of quite suddenly retracting its forepart like the bellows of a concertina, and when so compressed to heave it backward or in any direction, so that an immediate change of route is possible. The retraction and uplifting of the foreshortened part is astonis.h.i.+ngly rapid in view of the methodic movements of the animal as a whole. It is also notable that when the retraction takes place the tentacles are entirely withdrawn, otherwise they are for ever anxiously exploring every inch of the toilsome way. Scientific men have ent.i.tled one of the species--possibly the very one blunderingly introduced--SYNAPTA BESELLII, and brief reference is made to it elsewhere.

One member of the great "sea-cuc.u.mber," or BeCHE-DE-MER, family is especially noticeable because it is decorated with colours of which a gaily plumaged bird might be envious, though it has no other claim to comeliness. Most primitive in form--merely a flattened sac, oval and four inches long by three inches broad, with a purple and white mouth puckered as if contracted by a drawn string. Its general tint is grey; longitudinal bands of scarlet, green, violet, and purple radiate from the posterior and converge at the mouth, the hues blending rainbow-like. The brighter colours seem to have been carelessly and profusely applied, for they run when touched and smear the fingers. Among a family generally sad-hued and shrinking so conspicuous an example is quite prodigal and invites one to ponder upon the sportfulness of Nature. What special office in her processes does this fop of the species with prismatic complexion perform?

The functions of beche-de-mer are not only interesting, but requisite in the commonwealth of the coral reef, however purposeless to the observer intent upon the obvious and external only; while the genera are so numerous that doubtless to each species is consigned the performance of a special office. Some seem to delight in a diet of slush of the consistency of thin gruel; others prefer fine grit; others, again, coa.r.s.e particles of sh.e.l.l and coral grit and rough gravel. Peradventure the actual food consists of the micro-organisms in the slush and on the superficies of the una.s.similatable solids.

When submitted to the sun on the dry beach death is speedy, and decomposition in the case of some species complete to obliteration in a few hours. An apparently solid body, weighty in comparison with its size and apparently of such nature that rapid desiccation would convert it into a tough, leathery substance, it melts at the sight of the sun, leaving as a relic of existence its last meal--a handful of grit-covered with a transparent film of varnish, which the first wavelet of the flowing tide dissolves. Yet on the reef in a pool such an individual endures complacently water heated to a temperature of 108. Though feeble and of such readily dissolvable texture, beche-de-mer may be regarded as among the mightiest agents in the conversion of the waste of the coral reef into mud--the sort of mud of which some of the toughest of rocks are compounded. Graded by this and that species, the debris is reduced to fine particles, which upon sedimentation help to raise the level of the reef and thus prepare foundations for dry land.

For richness of colour and diversity of design some of the lovely corals and sponges, which seem to counterfeit the inventions and contrivances of man, and the algae, and those anomalous "growths" which fixedly adhere to the under surface of stones and blocks of coral debris, are not to be surpa.s.sed. These dull stones, partly buried in sand, reveal in blotches, daubs, and smears the crude extravagances of a painter's palette. Can it be that such brilliant colours and tints, so profuse and delicate, are necessary features of animals of such crude organisms that they appear to be merely disembodied splashes and driblets from the brush of the Great Artist? Look at this fantastic patchwork, brightening the obscurity of an upturned stone with glowing orange. In perfectly regular minute dots a pattern of quartered squares, raised slightly in the centre, is being worked out. Many of the squares are finished, but the fabric is rugged at the edges, where, with miraculous precision, the design is being followed, each tiny st.i.tch the counterpart of its fellow. Unless this gross and formless blotch of sage green interferes or this disc of royal blue expands, the whole under surface of the stone may be covered with an orange coloured quilt as dainty as if wrought by fairy fingers.

Why, again, is this particular miniature dome of coral so precisely spirally fluted, like the dome of a Byzantine cathedral? Why of so pure a mauve and bespangled with so many millions of snow-white crystals?

Why--where no eyes see them--should parti-coloured algae flaunt such graceful, flawless plumes? What marvellous fertility of imagination in form and design is exhibited in every quiet coral garden! Stolid battlemented walls, ma.s.sive shapeless blocks, rollicking mushrooms, tipsy toadstools; narrow fjords, sparklingly clear, wind among and intersect the stubborn ma.s.ses. Fish, bright as b.u.t.terflies and far more alert, flash in and out of mazes more bewildering than that in which Rosamond's bower was secluded. Starfish stud the sandy flats, a foot in diameter, red with burnished black bosses, and in all shades of red to pink and cream and thence to derogatory grey. Here is a jade-coloured conglomeration of life resembling nothing in the world more than a loose handful of worms without beginning and without end, interloped and writhing and glowing as it writhes with opalescent fires; and here a tiny leafless shrub, jointed with each alternate joint, ivory, white, and ruby-red respectively; again this tracery of gold and green and salmon pink decorating a s.h.i.+ny stone, in formal and consistent pattern. What is it? why is it? and why are such luminous tints so sordidly concealed?

CHARTER XIII

SOME MARINE NOVELTIES

"And call up unbound In various shapes old Proteus from the sea."

MILTON.

During the cool season the tides on the coast of North Queensland offer peculiar facilities to the observer of the thousand and one marvels of the tropic sea. Spring tides throughout the warm months range low at night and high during the day. In other words, the lowest day spring-tide in winter exposes far more of the reefs than the lowest day tide of summer, while the highest night tide of summer sweeps away the data of the corresponding tide of winter. When, therefore, the far receding water makes available patches of coral reef exposed at other times of the year merely to the cool glimpses of the moon, I am driven to explore them with an eagerness, if not of a treasure-seeker or in the frenzies of naturalistic fervour, at least with the enthusiasm of an ardent student.

It may be that most of the sights which are revealed are of common knowledge among scientific men, and if one is inclined to preach a little sermon on the text of the living stones and polyps and animated jelly, and if such text be trite, let it be granted that the sermon is at least original. Necessarily the sermon will lack commentary and application, and be very imperfect in many other details. If it possesses any virtues, you must apply them personally, for the preacher is not enlightened enough to expound them even to his own, much less to the satisfaction of others.

In many places on this reef little secrets, well kept throughout the rest of the year, are boldly proclaimed when the sea retreats. A fairly common one is a huge anemone of a rich cobalt blue which opens out like a soup-plate with convoluted edges. Another has a form something resembling a hyacinth-gla.s.s. The more public parts are not unlike a dwarf growth of that old-fas.h.i.+oned flower the Prince of Wales's feather, save that the colour is a rich brown. Being an animal, it possesses senses in which the most highly specialised vegetable is deficient. It has the power of waving its spikelets, and of the thousand of truncated tentacles which cover the spikelets each seems to possess independent action. Though all, no doubt, contribute to the sustenance of the animal, they, at will, rest from their labours or a.s.sume great activity.

It is natural to suppose that the diet of such an animal must be of microscopic proportions. The other day I happened on one which had seized a fish about four inches long, and seemed to be greedily sucking it to death. The fish was still alive, and as it looked up at me with a pathetic gleam in its watery eyes, I released it. It was very languid--indeed, so feeble and faint that it could not swim away. Aid had come too late. The fish was the legitimate prey of the anemone. My interference had been at variance from the laws of property and right. As the vestige of life which remained to the fish was all too fragile for salvation, and as I saw the chance of ascertaining whether the anemone had consciously seized it, or whether it had by mishap blundered against the anemone and had been arrested for its intrusion, I placed the fish close to the enemy. I am certain the anemone made an effort to reach it.