The leaf-cutting ant is the gardener. It is devoted to growing mushrooms or at least a kind of fungi of which it is fond. This accounts for the beds of leaves it carries to its nest, on which the fungi develop. The Roman naturalist, Pliny, gives an account of some ants in India which extract gold from mines during the winter. In the summer, when they retire to their holes to escape the heat, the people steal their gold. McCook has found that we have ants who are mineralogists, as they cover their hill with small stones, bits of fossils and minerals, for which they go down like miners more than a yard deep into the earth. That some kinds of ants are architects has been clearly proven, for an observer saw an ant architect order his workmen to alter a defective arch, which they did, apparently to suit his views of how arches should be constructed! The ants who act as sculptors work in wood. The red ants of the forest build storied houses in trees with pillars for support. There is a little brown ant which makes a house forty stories high; half the rooms are below ground. There are pillars, buttresses, galleries, and various rooms with arched roofs. This ant works in clay. If her material becomes too dry she is compelled to wait for moisture. The blind ant is a remarkable builder. She makes long galleries above ground. She does not use cement as some ants do, so she builds rapidly and her structure is flimsy. The Saiiva ants of Brazil are skillful masons. They construct chambers as large as a man's head that have immense domes, and outlets seventy yards long. The Brazilians say that the Indians, in cases of wounds, when it was necessary to close them as with stitching, used the jaws of the Saiiva ant. The ant was seized by the body and placed so that the mandibles were one on each side of the cut. Then, when pressed against the flesh, the ant would close the mandibles and unite the two sides of the cut as firmly as a good stitch would do it. A quick twist of the ant's body separated it from the head. After a few days the heads were removed with a knife and the operation was complete. In view of this we are tempted to say that ants are also _surgeons_, but die themselves instead of having their patients do so! A friend who has lived long in Brazil tells me that the Saiiva ants are so large the nuns in the convents use their bodies to dress as dolls, making them represent soldiers, brides and grooms, and so forth. One species of ants do nothing except capture slaves. These are not able to make their own nests, to feed their larvæ, or even to feed themselves, but are so helpless they would die if neglected by their servants. There are three species that keep slaves, but these are not the only ones who go to war, as the usually peaceful agricultural ants sometimes get short of seed and go forth to plunder each other's nests.