This species appears to have become extremely rare on the north coast of Britain. The natives in the Orkneys informed Mr. Bullock, in his late tour through those islands, that one male only had made his appearance for a long time, which had regularly visited Papa Westra for several years. The female (which the natives call the Queen of the Auks) was killed just before Mr. Bullock’s arrival. The King, or male, Mr. Bullock had the pleasure of chasing for several hours, in a six-oared boat, but without being able to kill him, for though he frequently got near him, so expert was the bird in its natural element, that it appeared impossible to shoot him. The rapidity with which he pursued his course under water was almost incredible. The length is three feet. The bill is black, very strong, compressed, and marked with several furrows. The base of the upper mandible is covered with short velvet-like feathers; between the bill and the eye is a large patch of white; the head, neck, back, and wings, glossy black; lesser quill-feathers tipped with white; legs black. The smallness of the wings renders them useless for flight, the longest quill-feather not exceeding four inches in length. These, however, are admirably adapted to its mode of life, and are of peculiar use in diving under water, where they act as fins; by which means it pursues its prey with astonishing velocity. This bird is only found in the most northern parts of the kingdom; it is said to breed in the isle of St. Kilda, from which Dr. Fleming had one in 1822. Like the rest of this genus it lays only one egg, white, sometimes irregularly marked with purplish lines, or blotched with ferruginous and black at the larger end: length six inches. It feeds on fish, but the young birds will eat rose root (_Rhodiola rosea_), or other plants.—_Montagu._ AURICULARS, _s._ (In _Ornithology_). Feathers which cover the ears. AVOIRDUPOIS, _a._ A kind of weight, of which a pound contains sixteen ounces, and is in proportion to a pound Troy as 17 to 14. AVOSET, Scooper, Crooked-Bill, or Yelper. _s._ (_Recurvirostra Avosetta_, LINNÆUS. _L’Avosette_, BUFFON.) [Illustration]