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Its orders have gone to the chemists who ensure the preservation of the honey by letting a drop of formic acid fall in from the end of their sting; to the capsule-makers who seal down the cells when the treasure is ripe, to the sweepers who maintain public places and streets most irreproachably clean, to the bearers whose duty it is to remove the corpses; and to the amazons of the guard who keep watch on the threshold by night and by day, question comers and goers, recognise the novices who return from their very first flight, scare away vagabonds, marauders and loiterers, expel all intruders, attack redoubtable foes in a body, and, if need be, barricade the entrance.
The vapour may be obtained by distillation, but this process is open to objections to which the other is not. In some cases it becomes changed in the body into formic acid, which should therefore be sought for. Tests. With nitrate of silver a white precipitate, insoluble in cold, but soluble in boiling, nitric acid.
They call him rusa, which means russet. It is he who produces the formic acid, a poison which he sheds with his abdomen into the bite which he makes with his mandibles or jaws, which makes the wound a little red, and makes it itch and burn a little." He was going on to add that mandibula signified jaw bone; abdomen, meant belly.
Can she imitate, to a certain extent, the Processionaries' method, that is to say, does she leave, along the road traversed, not a series of conducting threads, for she is not equipped for that work, but some odorous emanation, for instance some formic scent, which would allow her to guide herself by means of the olfactory sense? This view is pretty generally accepted.
Dyestuffs include, by definition, all the coal-tar dyes, colours, and colouring matter, and all organic intermediate products used in the manufacture of these the last category including a large number of chemicals such as formaldehyde, formic acid, acetic acid, and methyl alcohol.
It is written, however, that few in the insect world can withstand a queen of the yellow devils, and in a few seconds the wasp got up and flew home again, quite unperturbed. The robber-fly did not get up, and she was not quite unperturbed, but died as they die who are poisoned with formic acid, and very soon was still.
With respect to the baths: it having been discovered that a beneficial result attended the external application of the liquor left after the coction of the leaves, a bathing establishment was added to the factory. This liquor is of a greenish-brown tint; and, according to the process, is either gelatinous and balsamic, or acid; formic acid having been produced in the latter case.
Like most of their congeners, the animals die when exposed to the sun. It is little feared in the Gaboon; when its armies attack the mission-houses, they are easily stopped by lighting spirits of turpentine, or by a strew of quicklime, which combines with the formic acid. Wilson less sensationally calls it what it is, a "live raft."
For example, urea, formic acid, indigo, and many other bodies, hitherto produced only by animals and plants, were easily produced by the chemist by purely chemical methods.
Let us now see what will happen when the formic scent, if there really be one on the trail, is replaced by another, much stronger odour, one perceptible to our own sense of smell, which the first is not, at least not under present conditions. I wait for a third sortie and, at one point in the road taken by the Ants, rub the ground with some handfuls of freshly gathered mint.
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