On the terebinth, the simplest of these dwellings consists of a lateral fold of the leaf, the edge of which is turned back over the upper surface and fastened to it without losing its green colour. This hem gives a very low-roofed dwelling: the floor and the ceiling meet. Therefore, being unduly confined, the family is not numerous. The timid maker of these green hems bears the name of Pemphigus pallidus, DERB. She is called pale because she has not the knack of painting her house purple. Elsewhere the lateral fold, still turned over the upper surface of the leaf, grows much thicker, swells with fleshy tissue, develops wrinkles, assumes a crimson hue and becomes a short, hollow, spindle-shaped growth. This home, a fairly successful imitation of the seed-pods of the peony and the larkspur, belongs to the Pemphigus follicularius, PASS. Elsewhere again the fold, which at first is made in the plane of the leaf, is now bent down at right angles under the leaf, becoming an ear-shaped appendage, a knotted, fleshy crescent, with a straw-yellow as its prevailing colour. This is the work of the Pemphigus semilunaris, PASS. The spherical galls take higher rank in the Plant-louse’s art. They are smooth, pale-yellow globes, varying in size from that of a cherry to that of an average apricot. They hang from the base of the leaves, which, despite these monstrous bladders, retain their normal colour, and, in all other respects, their normal shape. The insect which inflates these pretty capsules is Pemphigus utricularius, PASS. But the most remarkable structures are the horn-shaped galls, truly Cyclopean monuments compared with their minute builders. Some attain a length of nine inches and are as thick as the neck of a claret-bottle. Grouped in threes or fours at the tips of the upper branches, they form barbaric trophies, twisted and fantastic danger-signals which might have graced the brows of some Alpine Ibex. The other galls all fall off with the leaves; not a trace of them remains on the tree in winter, and even these firmly cemented to their bough, last for a long time. Only the protracted assaults of wind and weather will destroy them completely. The base itself does not easily disappear. Next year it is still in its place, but dilapidated and reduced to the broken stump of a horn of plenty packed with the waxy felt that clothed the population in the days of its prosperity. In these palaces lived Pemphigus cornicularius, PASS.