Another objectionable habit of the tropical ants, viewed practically, is their total disregard of vested interests in the case of house property. Like Mr. George and his communistic friends, they disbelieve entirely in the principle of private rights in real estate. They will eat their way through the beams of your house till there is only a slender core of solid wood left to support the entire burden. I have taken down a rafter in my own house in Jamaica, originally 18 inches thick each way, with a sound circular centre of no more than 6 inches in diameter, upon which all the weight necessarily fell. With the material extracted from the wooden beams they proceed to add insult to injury by building long covered galleries right across the ceiling of your drawing-room. As may be easily imagined, these galleries do not tend to improve the appearance of the ceiling; and it becomes necessary to form a Liberty and Property Defence League for the protection of one's personal interests against the insect enemy. I have no objection to ants building galleries on their own freehold, or even to their nationalising the land in their native forests; but I do object strongly to their unwarrantable intrusion upon the domain of private life. Expostulation and active warfare, however, are equally useless. The carpenter-ant has no moral sense, and is not amenable either to kindness or blows. On one occasion, when a body of these intrusive creatures had constructed an absurdly conspicuous brown gallery straight across the ceiling of my drawing-room, I determined to declare open war against them, and, getting my black servant to bring in the steps and a mop, I proceeded to demolish the entire gallery just after breakfast. It was about 20 feet long, as well as I can remember, and perhaps an inch in diameter. At one o'clock I returned to lunch. My black servant pointed, with a broad grin on his intelligent features, to the wooden ceiling. I looked up; in those three hours the carpenter-ants had reconstructed the entire gallery, and were doubtless mocking me at their ease, with their uplifted antennæ, under that safe shelter. I retired at once from the unequal contest. It was clearly impossible to go on knocking down a fresh gallery every three hours of the day or night throughout a whole lifetime.
Ants, says Mr. Wallace, without one touch of satire, 'force themselves upon the attention of everyone who visits the tropics.' They do, indeed, and that most pungently; if by no other method, at least by the simple and effectual one of stinging. The majority of ants in every nest are of course neuters, or workers, that is to say, strictly speaking, undeveloped females, incapable of laying eggs. But they still retain the ovipositor, which is converted into a sting, and supplied with a poisonous liquid to eject afterwards into the wound. So admirably adapted to its purpose is this beautiful provision of nature, that some tropical ants can sting with such violence as to make your leg swell and confine you for some days to your room; while cases have even been known in which the person attacked has fainted with pain, or had a serious attack of fever in consequence. It is not every kind of ant, however, that can sting; a great many can only bite with their little hard horny jaws, and then eject a drop of formic poison afterwards into the hole caused by the bite. The distinction is a delicate physiological one, not much appreciated by the victims of either mode of attack. The perfect females can also sting, but not, of course, the males, who are poor, wretched, useless creatures, only good as husbands for the community, and dying off as soon as they have performed their part in the world—another beautiful provision, which saves the workers the trouble of killing them off, as bees do with drones after the marriage flight of the queen bee.
The blind driver-ants of West Africa are among the very few species that render any service to man, and that, of course, only incidentally. Unlike most other members of their class, the driver-ants have no settled place of residence; they are vagabonds and wanderers upon the face of the earth, formican tramps, blind beggars, who lead a gipsy existence, and keep perpetually upon the move, smelling their way cautiously from one camping-place to another. They march by night, or on cloudy days, like wise tropical strategists, and never expose themselves to the heat of the day in broad sunshine, as though they were no better than the mere numbered British Tommy Atkins at Coomassie or in the Soudan. They move in vast armies across country, driving everything before them as they go; for they belong to the stinging division, and are very voracious in their personal habits. Not only do they eat up the insects in their line of march, but they fall even upon larger creatures and upon big snakes, which they attack first in the eyes, the most vulnerable portion. When they reach a negro village the inhabitants turn out en masse, and run away, exactly as if the visitors were English explorers or brave Marines, bent upon retaliating for the theft of a knife by nobly burning down King Tom's town or King Jumbo's capital. Then the negroes wait in the jungle till the little black army has passed on, after clearing out the huts by the way of everything eatable. When they return they find their calabashes and saucepans licked clean, but they also find every rat, mouse, lizard, cockroach, gecko, and beetle completely cleared out from the whole village. Most of them have cut and run at the first approach of the drivers; of the remainder, a few blanched and neatly-picked skeletons alone remain to tell the tale.
As I wish to be considered a veracious historian, I will not retail the further strange stories that still find their way into books of natural history about the manners and habits of these blind marauders. They cross rivers, the West African gossips declare, by a number of devoted individuals flinging themselves first into the water as a living bridge, like so many six-legged Marcus Curtiuses, while over their drowning bodies the heedless remainder march in safety to the other side. If the story is not true, it is at least well invented; for the ant-commonwealth everywhere carries to the extremest pitch the old Roman doctrine of the absolute subjection of the individual to the State. So exactly is this the case that in some species there are a few large, overgrown, lazy ants in each nest, which do no work themselves, but accompany the workers on their expeditions; and the sole use of these idle mouths seems to be to attract the attention of birds and other enemies, and so distract it from the useful workers, the mainstay of the entire community. It is almost as though an army, marching against a tribe of cannibals, were to place itself in the centre of a hollow square formed of all the fattest people in the country, whose fine condition and fitness for killing might immediately engross the attention of the hungry enemy. Ants, in fact, have, for the most part, already reached the goal set before us as a delightful one by most current schools of socialist philosophers, in which the individual is absolutely sacrificed in every way to the needs of the community.
The most absurdly human, however, among all the tricks and habits of ants are their well known cattle-farming and slave-holding instincts. Everybody has heard, of course, how they keep the common rose-blight as milch cows, and suck from them the sweet honey-dew. But everybody, probably, does not yet know the large number of insects which they herd in one form or another as domesticated animals. Man has, at most, some twenty or thirty such, including cows, sheep, horses, donkeys, camels, llamas, alpacas, reindeer, dogs, cats, canaries, pigs, fowl, ducks, geese, turkeys, and silkworms. But ants have hundreds and hundreds, some of them kept obviously for purposes of food; others apparently as pets; and yet others again, as has been plausibly suggested, by reason of superstition or as objects of worship. There is a curious blind beetle which inhabits ants' nests, and is so absolutely dependent upon its hosts for support that it has even lost the power of feeding itself. It never quits the nest, but the ants bring it in food and supply it by putting the nourishment actually into its mouth. But the beetle, in return, seems to secrete a sweet liquid (or it may even be a stimulant like beer, or a narcotic like tobacco) in a tuft of hairs near the bottom of the hard wing-cases, and the ants often lick this tuft with every appearance of satisfaction and enjoyment. In this case, and in many others, there can be no doubt that the insects are kept for the sake of food or some other advantage yielded by them.
But there are other instances of insects which haunt ants' nests, which it is far harder to account for on any hypothesis save that of superstitious veneration. There is a little weevil that runs about by hundreds in the galleries of English ants, in and out among the free citizens, making itself quite at home in their streets and public places, but as little noticed by the ants themselves as dogs are in our own cities. Then, again, there is a white woodlouse, something like the common little armadillo, but blind from having lived so long underground, which walks up and down the lanes and alleys of antdom, without ever holding any communication of any sort with its hosts and neighbours. In neither case has Sir John Lubbock ever seen an ant take the slightest notice of the presence of these strange fellow-lodgers. 'One might almost imagine,' he says, 'that they had the cap of invisibility.' Yet it is quite clear that the ants deliberately sanction the residence of the weevils and woodlice in their nests, for any unauthorised intruder would immediately be set upon and massacred outright.
Sir John Lubbock suggests that they may perhaps be tolerated as scavengers: or, again, it is possible that they may prey upon the eggs or larvæ of some of the parasites to whose attacks the ants are subject. In the first case, their use would be similar to that of the wild dogs in Constantinople or the common black John-crow vultures in tropical America: in the second case, they would be about equivalent to our own cats or to the hedgehog often put in farmhouse kitchens to keep down cockroaches.
The crowning glory of owning slaves, which many philosophic Americans (before the war) showed to be the highest and noblest function of the most advanced humanity, has been attained by more than one variety of anthood. Our great English horse-ant is a moderate slaveholder; but the big red ant of Southern Europe carries the domestic institution many steps further. It makes regular slave-raids upon the nests of the small brown ants, and carries off the young in their pupa condition. By-and-by the brown ants hatch out in the strange nest, and never having known any other life except that of slavery, accommodate themselves to it readily enough. The red ant, however, is still only an occasional slaveowner; if necessary, he can get along by himself, without the aid of his little brown servants. Indeed, there are free states and slave states of red ants side by side with one another, as of old in Maryland and Pennsylvania: in the first, the red ants do their work themselves, like mere vulgar Ohio farmers; in the second, they get their work done for them by their industrious little brown servants, like the aristocratic first families of Virginia before the earthquake of emancipation.
But there are other degraded ants, whose life-history may be humbly presented to the consideration of the Anti-Slavery Society, as speaking more eloquently than any other known fact for the demoralising effect of slaveowning upon the slaveholders themselves. The Swiss rufescent ant is a species so long habituated to rely entirely upon the services of slaves that it is no longer able to manage its own affairs when deprived by man of its hereditary bondsmen. It has lost entirely the art of constructing a nest; it can no longer tend its own young, whom it leaves entirely to the care of negro nurses; and its bodily structure even has changed, for the jaws have lost their teeth, and have been converted into mere nippers, useful only as weapons of war. The rufescent ant, in fact, is a purely military caste, which has devoted itself entirely to the pursuit of arms, leaving every other form of activity to its slaves and dependents. Officers of the old school will be glad to learn that this military insect is dressed, if not in scarlet, at any rate in very decent red, and that it refuses to be bothered in any way with questions of transport or commissariat. If the community changes its nest, the masters are carried on the backs of their slaves to the new position, and the black ants have to undertake the entire duty of foraging and bringing in stores of supply for their gentlemanly proprietors. Only when war is to be made upon neighbouring nests does the thin red line form itself into long file for active service. Nothing could be more perfectly aristocratic than the views of life entertained and acted upon by these distinguished slaveholders.
On the other hand, the picture has its reverse side, exhibiting clearly the weak points of the slaveholding system. The rufescent ant has lost even the very power of feeding itself. So completely dependent is each upon his little black valet for daily bread, that he cannot so much as help himself to the food that is set before him. Hüber put a few slaveholders into a box with some of their own larvæ and pupæ, and a supply of honey, in order to see what they would do with them. Appalled at the novelty of the situation, the slaveholders seemed to come to the conclusion that something must be done; so they began carrying the larvæ about aimlessly in their mouths, and rushing up and down in search of the servants. After a while, however, they gave it up and came to the conclusion that life under such circumstances was clearly intolerable. They never touched the honey, but resigned themselves to their fate like officers and gentlemen. In less than two days, half of them had died of hunger, rather than taste a dinner which was not supplied to them by a properly constituted footman. Admiring their heroism or pitying their incapacity, Hüber at last gave them just one slave between them all. The plucky little negro, nothing daunted by the gravity of the situation, set to work at once, dug a small nest, gathered together the larvæ, helped several pupæ out of the cocoon, and saved the lives of the surviving slaveowners. Other naturalists have tried similar experiments, and always with the same result. The slaveowners will starve in the midst of plenty rather than feed themselves without attendance. Either they cannot or will not put the food into their own mouths with their own mandibles.