"We have finished the walnut family," said Miss Harson, "but there is a tree that I wish to speak of here because of its long pinnate leaves, which appear to connect it with the walnuts and hickories. This is the ailanthus, a large tree which you have often seen in the village, and which used to be popular as a shade-tree. It is very clean-looking, for the only insect that will eat its leaves is the silkworm."