Fig. 155. Ant-nest, on a piece of plank, which has a moat near its edge to confine the insects.
What I have seen of interest in this nest on my table would fill a small volume, if written out in detail. Just now a worker approached a pupa, that appears through the lens like a little bag of meal tied at one end with a black string; she examined it carefully with her antennæ and concluded it needed to be moved, and, though it is as large as she, picked it up in her jaws and carried it to a position which she regarded as more favorable. Then she approached a larva which looks like a little crook-neck squash, inquired as to its needs with her antennæ and then cleaned it with her tongue, as a cat licks a kitten, and fed it. Her next duty was to pick up a whole bunch of little white oblong eggs and scurry off with them to get them out of the light. Then she stopped to help another worker to straighten out the soft legs and antennæ of a pale, new sister that was just emerging from the pupa skin. By the time I had seen as much as this I felt it my duty to replace the cover, as the light greatly disturbs the little captives. It is said that if a yellow glass be used for the upper piece, the ants feel that they are in darkness, and their actions may be watched constantly without disturbing them.
For a permanent nest, it is necessary to secure a queen, which lays all the eggs for the colony. She may be recognized by her larger size and may sometimes be found in a nest under the stones. However, it is so difficult to obtain a queen that I more often bring in the young and the workers; the latter will be content as long as they have the babies to feed and bring up; when finally this is accomplished, I usually take my colony back to its nest in the field, where it is made most welcome. This may seem sentimental, but after you have watched these little people working so hard and taking such devoted care of their baby sisters and doing so many wise things in their home, you will be loth to let the tiny creatures die of discouragement because they have nothing else to do, and you will be still more loth to let them loose to scatter, bewildered and helpless, over a strange earth. However, I have to be very careful and mark the nest to which they belong, for if I should put them near another colony, my poor captives would soon die inglorious deaths.
Food which we provide for the ants in captivity should be varied and should be put on the island, rather than in the nest as we may thus be able to better clean away the refuse. Crackers or bread soaked in sweetened water, sponge cake, berry-jam, sugar, bits of raw meat, yolks of hard boiled eggs crushed, freshly killed insects or earth-worms, all may prove acceptable to our little friends. Their food may be soft but should not be in a fluid state.
Questions About Ants.
If you have not made an ant-nest and observed the ant as indicated, make some field observations. These may be made with the naked eye, or with a tripod lens. Such a lens costs about thirty-five cents.
1. Have you ever seen an ant-hill? If so, describe it.
2. Do all ants build mound nests?
3. In what situations have you found ant-nests?