A scarcely less minute account follows of the ‘Malacostraca’ or crustaceans, the lobsters and the crabs, the shrimps and the prawns, and others of their kind, a chapter to which Cuvier devoted a celebrated essay. There be many kinds of crabs—the common kind, the big ‘granny’ crabs, the little horsemen-crabs, that scamper over the sand and which are for the most part empty, that is to say, whose respiratory cavities are exceptionally large; and there are the freshwater crabs. There are the little shrimps and the big hump-backed fellows, or prawns; there are the ‘crangons’ or squillae; and the big lobsters and the crawfish or ‘langoustes’, their spiny cousins. We read about their beady eyes, which turn every way; about their big rough antennae and the smaller, smoother pair between; the great teeth, or mandibles; the carapace with its projecting rostrum, the jointed abdomen with the tail-fins at the end, and the little flaps below on which the female drops her spawn. In more or less detail these things are severally described, and the many limbs severally enumerated, in one kind after another. The descriptions of the lobster and the langouste are particularly minute, and the comparison or contrast between the two is drawn with elaborate precision. In the former, besides other differences between male and female, the female is said to have the ‘first foot’ (or leg) bifurcate, while in the male it is undivided. It seems a trifling matter, but it is true; it is so small a point that I searched long before at last I found mention made of it in a German monograph. The puzzling thing is that it is (as we should say) the last and not the first leg which is so distinguished; but after all, it is only a convention of our own to count the limbs from before backwards. To inspect a lobster’s limbs, we lay it on its back (as Aristotle did), and see the legs overlapping, each hinder one above the one before; the hindmost is the first we see, and the one we must first lift up to inspect the others.
Aristotle’s account of fishes is a prodigious history of habits, food, migrations, modes of capture, times and ways of spawning, and anatomical details; but it is not here that we can elucidate or even illustrate this astonishing Ichthyology. It is not always easy to understand—but the obstacle lies often, I take it, in our own ignorance. The identification of species is not always plain, for here as elsewhere Aristotle did not reckon with a time or place where the familiar words of Greek should be unknown or their homely significance forgotten. Among the great host of fish-names there are several referring, somehow or other, to the Grey Mullet, which puzzle both naturalist and lexicographer. A young officer told me the other day how he had watched an Arab fisherman emptying out his creel of Grey Mullet on some Syrian beach, and the Arab gave four if not five names to as many different kinds, betwixt which my friend could see no difference whatsoever. Had my friend been an ichthyologist he would doubtless have noticed that one had eyelids and the others none; that one had little brushes on its lips, another a small but wide-open slit under the jaw, another a yellow spot on its gill-covers, and so on. The Mullets are a difficult group, but Aristotle, like the Arab fisherman, evidently recognized their fine distinctions and employed the appropriate names. Again, Aristotle speaks of a certain nest-building fish, the ‘phycis’, and regarding this Cuvier fell into error (where once upon a time I followed him). In Cuvier’s time there was but one nest-building fish known such as to suit, apparently, the passage, namely the little black goby; but after Cuvier’s day the nest-building habits of the ‘wrasses’ became known to naturalists, as they had doubtless been known ages before to the fishermen—and to Aristotle.
Like almost every other little point on which we happen to touch, we might make this one the starting-point (here comes in the delight and fascination of the interpreter’s task!) for other stories.
Speusippus, Plato’s successor in the Academy, was both philosopher and naturalist, and we may take it, if we please, that his leaning towards biology, and the biological trend which at this time became more and more marked in Athenian philosophy, were not unconnected with the great impulse which Aristotle had given. However this may be, Speusippus wrote a book περι Ὁμοιων ‘Concerning Resemblances’; and this, of which we only possess a few fragmentary sentences, must have been a very curious and an interesting book. He mentions, among other similar cases, that our little fish phycis has a close outward semblance to the sea-perch; and this is enough to clinch the proof that Aristotle’s nest-building fish was not a goby but a wrasse. The whole purport of Speusippus’s book seems to have been to discuss how, or why, with all Nature’s apparently infinite variety, certain animals have a singularly close resemblance to certain others, though they be quite distinct in kind. It is a problem which perplexes us still, when we are astonished and even deluded by the likeness between a wasp and a hover-fly, a merlin and a cuckoo. In certain extreme cases we call it ‘mimicry’, and invoke hypotheses to account for this ‘mimetic’ resemblance; and those of us who reject these hypotheses must fain take refuge in others, as far-reaching in their way. This at least we know, that Speusippus seized upon a real problem of biology, of lasting interest and even of fundamental importance.
To come back to Aristotle and his fishes, let us glance at one little point more. The reproduction of the eel is an ancient puzzle, which has found its full solution only in our own day. While the salmon, for instance, comes up the river to breed and goes down again to the sea, the eel goes down to the ocean to spawn, and the old eels come back no more but perish in the great waters. The eel’s egg develops into a little flattened, transparent fish, altogether different in outward appearance from an eel, which turns afterwards into a young eel or ‘elver’; and Professor Grassi, who had a big share in elucidating the whole matter, tells us the curious fact that he found the Sicilian fishermen well acquainted with the little transparent larva (the Leptocephalus of modern naturalists), that they knew well what it was, and that they had a name for it—Casentula. Now Aristotle, in a passage which I think has been much misunderstood (and which we must admit to be in part erroneous), tells us that the eel develops from what he calls γης εντερα, a word which we translate, literally, the ‘guts of the earth’, and which commentators interpret as ‘earthworms’! But in Sicilian Doric, γης εντερα would at once become γας εντερα; and between ‘Gasentera’ and the modern Sicilian ‘Casentula’ there is scarce a hairbreadth’s difference. So we may be permitted to suppose that here again Aristotle was singularly and accurately informed; and that he knew by sight and name the little larva of the eel, whose discovery and identification is one of the modest triumphs of recent investigation.
Aristotle’s many pages on fishes are delightful reading. The anatomist may read of such recondite matters as the placenta vitellina of the smooth dog-fish, whereby the viviparous embryo is nourished within the womb, after a fashion analogous to that of mammalian embryology—a phenomenon brought to light anew by Johannes Müller, and which excited him to enthusiastic admiration of Aristotle’s minute and faithful anatomy. Again we may read of the periodic migration of the tunnies, of the great net or ‘madrague’ in which they are captured, and of the watchmen, the θυννοσκοποι, the ‘hooers’ of our ancient Cornish fishery, who give warning from tower or headland of the approaching shoal. The student may learn what manner of fish it was (the great Eagle-ray) with whose barbed fin-spine—most primitive of spear-heads—Ulysses was slain; and again, he may learn not a little about that ναρκη, or torpedo, to which Meno compared his master Socrates, in a somewhat ambiguous compliment.
In rambling fashion Aristotle has a deal to tell us about insects, and he has left us a sort of treatise on the whole natural history of the bee. He knew the several inmates of the hive, though like others of his day (save, perhaps, only Xenophon), and like Shakespeare too, he took the queen-bee for a king. He describes the building of the comb, the laying of the eggs, the provision of the larvae with food. He discusses the various qualities of honey and the flowers from which these are drawn. He is learned in the diseases and the enemies of bees. He tells us many curious things about the economy of the hive and the arts of the bee-keeper, some of which things have a very modern and familiar look about them: for instance, the use of a net or screen to keep out the drones, a net so nicely contrived that these sturdy fellows are just kept out, while the leaner, slenderer workers are just let in. But it would be a long, long story to tell of Aristotle’s knowledge of the bee, and to compare it with what is, haply, the still deeper skill and learning of that master of bee-craft, Virgil.
Then, having perfect freedom to go whithersoever we chose and to follow the bees across the boundless fields of ancient literature, we might read of the wild bees and of their honey out of a rock, and of the hive-bees too, in Homer; follow them to their first legendary home in Crete, where the infant Jupiter was fed on honey—as a baby’s lips are touched with it even unto this day; trace their association with Proserpine and her mother, or their subtler connexion with Ephesian Diana; find in the poets, from Hesiod to the later Anthology, a hundred sweet references—to the bee-tree in the oak-wood, to the flowery hill Hymettus. Perhaps, at last, we might even happen on the place where Origen seems so strangely to foreshadow Shakespeare—speaking of the king of the bees with his retinue of courtiers (his officers of sorts), the relays of workmen (the poor mechanic porters crowding in), the punishment of the idle (where some, like magistrates, correct at home), the wars, the vanquished, and the plunder (which pillage they with merry march bring home To the tent-royal of their Emperor).
Go back to Aristotle, and we may listen to him again while he talks of many other kindred insects: of the humble-bee and its kind, of the mason-bee with its hard round nest of clay, of the robber-bees, and of the various wasps and hornets; or (still more curiously and unexpectedly) of the hunter-wasp or ‘ichneumon’, and how it kills the spider, carries it home to its nest, and lays its eggs in its poor body, that the little wasp-grubs may afterwards be fed. Or again of the great wasps which he calls Anthrenae, and how they chase the big flies, and cut off their heads, and fly away with the rest of the carcass—all agreeing to the very letter with what Henri Fabre tells us of a certain large wasp of Southern Europe, and how it captures the big ‘taons’ or horse-flies: ‘Pour donner le coup de grâce à leurs Taons mal sacrifiés, et se débattants encore entre les pattes du ravisseur, j’ai vu des Bembex mâchonner la tête et le thorax des victimes.’ Verily, there is nothing new under the sun.
With the metamorphoses of various insects Aristotle was well acquainted. He knew how the house-fly passes its early stages in a dung-hill, and how the grubs of the big horse-flies and Tabanids live in decayed wood; how certain little flies or gnats are engendered (as he calls it) in the slime of vinegar. He relates with great care and accuracy the life-history of the common gnat, from its aquatic larva, the little red ‘blood-worm’ of our pools; he describes them wriggling about like tiny bits of red weed, in the water of some half-empty well; and he explains, finally, the change by which they become stiff and motionless and hard, until a husk breaks away and the little gnat is seen sitting upon it; and by and by the sun’s heat or a puff of wind starts it off, and away it flies.