female always moults in this manner during the period of incubation, and does not recover her plumage till the young are ready to fly. Horsfield mentions having been told that should the male bird discover that a rival has attempted to minister to his partner's wants during his absence in search of food, he at once tears down the protecting wall, and leaves his fickle mistress to perish from exposure and hunger. The nest of this bird described by Bernstein was formed of a few twigs and chips of wood placed at the bottom of the hole, which contained a still blind nestling, and an egg that was nearly hatched. The latter was of small size, oval in form, and had a rough white shell, marked here and there with pale red and brown spots and cloudings. In an account given by Layard of the incubation of an allied species, he says: "My friend, Mrs. Baker, thus speaks of the singular habits this bird exhibits, in common with its congeners, of blocking up the sitting female in her nest:--'Building her up with mud and sticks into old broken hollow trees, or between the crowded stems of the tall euphorbia in the forests, and closing up the entrance in such a manner that it is impossible to escape, only leaving a small hole for the purpose of feeding her during her long imprisonment; I do not know how long she is thus kept in durance vile, but we have sometimes taken the females out, and found them so cramped and weak as to be unable to fly. This peculiar habit may be a precautionary measure, to protect the female during the season of incubation, as she may be too dull and exhausted to fly from approaching danger. Depend upon it, it is not done in vain. We self-willed and presumptuous beings often act without reason or reflection, but the birds of the air and the lilies of the field are protected by a higher Power.'" THE ABBAGAMBA, OR ABYSSINIAN HORNBILL. The ABBAGAMBA, or ABYSSINIAN HORNBILL (_Bucorax Abyssinicus_), a well-known African species of the above family, is a large, powerfully-formed bird, with short wings and tail and long legs. Its huge beak, about a foot in length, is slightly curved, flat at its sides, and blunt at the tip. The base of the upper mandible is surmounted by a high protuberance. The regions of the eye and throat are bare, and very brightly coloured. In the wing the sixth quill is longer than the rest. The entire plumage, except six yellowish white primary quills, is of a glossy black, the eye is dark brown, and the beak black, with a red and yellow spot on its upper mandible. The eye-rings and throat are dark grey, the latter bordered with bright red. The female is smaller than her mate, and has only a comparatively small portion of her neck bare. The length of the male is forty-three inches and a half, and his breadth seventy inches; the wing measures twenty-one inches and three-quarters, and the tail thirteen inches and a half. [Illustration: THE ABBAGAMBA, OR ABYSSINIAN HORNBILL (_Bucorax Abyssinicus_).]