Lippincott's Magazine of Popular Literature and Science, Vol. 22, November, 1878

by Various

I threw down a handful of apple-seeds near the entrance of the active hill on the barrens. This immediately attracted a large number of excited ants. They rushed to the seeds in a warlike attitude, and began carrying them off, depositing them two or three feet away. But as soon as the excitement caused by the sudden pouring down of the seeds had subsided, they seemed to comprehend that they had been throwing away good seeds; and now, changing their tactics, not only carried the remainder into the nest, but finally brought back and stored all those that had been thrown away.

On excavating the nests we found granaries of seed scattered irregularly throughout to the depth of twenty-two inches below the surface of the ground: some were near the surface, and a few sprouted seeds were scattered about in the mound. The mound is usually not more than four to six inches above the level of the ground.

The great majority of nests that I have found are in the low pine barrens—so low that on reaching the depth of two feet the water runs into the cavity like a spring, and stands above some of the granaries. Notwithstanding this wet locality, I found no sprouted seeds in the deeper store-rooms, but only in the warmer mound. On sunny days the larvæ are brought up into the mound and deposited in chambers near the surface, where they receive the benefit of the sun's rays. On cool, cloudy days and in the early morning I found no larvæ near the surface. If the ants are intelligent enough to treat the larvæ in this way, why should they not store seeds where they will not sprout? And when they need to sprout them in order to obtain the sugar they contain, it would take no more wisdom to treat the seed as they do the larvæ—bringing them near the surface to obtain the right degree of heat for the required result.

The little workers seem very determined not to allow any green thing to grow on their mounds. Cassia and croton and many other plants start to grow from seeds which the ants have dropped, but they are always cut down and destroyed if too near the mound, though allowed to grow at a little distance; so that a botanist would be astonished at the great variety of plants within a small area if not aware of the source from which they came. I sometimes found small shrubs of Kalmia hirsuta and Hypericums entirely dead on the mounds, the roots completely girdled in many places. It is very amusing to watch them in their efforts to destroy grass and other plants. Their determined persistence is remarkable: they cut off the tender blades and throw them away. But they do not stop here: the roots must be exterminated; so several dig around the plant, throwing the earth backward, and after making it bare they cut and girdle the roots until the plant is killed.

1. With well-formed teeth. 2. Partially developed.
3. Entirely obsolete.
MANDIBLES OF THE HARVESTING-ANT.

Early in March the ants in the jar seemed to have completed their domicile. At first, several chambers were visible through the glass, and the galleries leading to them, but gradually the light was all shut out by placing little particles of earth against the glass, thus depriving me of the opportunity of watching their movements within the nest. So I now took the jar to the barrens, and set it by the side of a nest which was about a mile distant from where most of the ants were obtained. Here I carefully broke it, and took the thin shell of glass from around the nest, which did not fall, but stood six inches in height and eighteen inches in circumference. With a large knife I removed a thin layer of earth, which revealed three admirable chambers with galleries leading from one to the other. Immediately below there were five chambers well filled with ants, and below these other chambers were scattered irregularly throughout, with only thin partitions between.

At various times I had given the ants moistened sugar on the thick curved leaves of the live-oak, and several of these had been covered while the ants were making their excavations. Two of the leaves were three inches below the surface, and the ants had utilized them by making the inner curved surface answer for the floor and sides of fine chambers; and here a large number of ants, both soldiers and workers, were crowded together. In other chambers I found the larvæ, which were greatly increased in size since I had placed them in the jar; and the larvæ of the carpenter-ant were being reared, as I found some smaller than any I had introduced belonging to the harvester.

Very soon a great crowd of excited ants came from the hill near which I had broken the jar, and began to transport the larvæ, and also the mature ants, to their own dominions. There was no fighting: the ants from the jar submitted to being carried, not offering the least resistance. A small worker would often take hold of a large soldier, sometimes pushing, sometimes dragging, her through the sand, and she would be as quiet as if dead or dying; but if we touch the little worker she leaves her burden and rushes about to see what the interference means; and now the soldier straightens up, as bright and lively as the rest, and after passing her fore legs over her head and body, goes of her own accord into the new nest, meeting with no opposition. Some of the ants would coil up and allow themselves to be carried easily. Others were led along by an antenna or a leg, in either case manifesting no resistance. For three hours I watched the proceeding, and could see no fighting. It looked precisely as if the inhabitants of the jar realized their helpless condition, and gladly submitted to be taken prisoners or to become partners with this new firm.

I left them, and after the lapse of two hours again visited the spot. The seeds that had been in the jar were now being transferred to the other nest, and two new entrances at the base of the mound were being made. And now every little while an ant would be ejected from the nest. One worker would bring another out and lay her down, often not more than three inches away from the door, but, so far as I could see, she was in no wise injured. Her first movement was to make herself presentable by passing her fore legs over her head and body: as soon as this was completed she returned within the nest. But there was one large soldier which the whole community seemed combined against. She was led or dragged away from the entrance of the nest eight times, and each time left at the base of the mound among the rubbish. Sometimes she was led or carried by one alone, sometimes two or three would conduct her, and then leave her, when she would at once proceed to make her toilet; which completed, she would again return to the door of the nest, when she would be again conducted away, offering no resistance. I now picked her up, which made her very fierce. She seized my glove with her powerful mandibles, and held on with a persistency equal to the most vicious species, at the same time trying to use her sting. As soon as I could free her from the glove I secured her, and on reaching home placed her under the microscope, and found she was not injured and had strong teeth in her mandibles.