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. [Illustration: 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.