"Why, do you not remember our talk about silkworms?" replied their governess. "I am sure I told you that they would not live here in the open air, but they do in China; and the ailanthus is a Chinese tree. It was planted in Great Britain over a hundred years ago for the express purpose of feeding silkworms, because a species of silkworm which was known to be hardy and capable of forming its cocoons in the English climate is attached to this tree and feeds upon its leaves. It was not successful, however, for silkworms, but as a stately and ornamental tree with tropical-looking foliage it was much admired. The ailanthus is quite common in this country as a wayside tree. It possesses a good deal of beauty, from the size and graceful sweep of its large compound leaves, that retain their brightness and verdure after midsummer, when our native trees have become dull. These leaves have nine or ten leaflets as large as a beech-leaf."