Nutria fur is largely used in the hat manufacture; and has become, within the last fifteen or twenty years, an article of very considerable commercial importance. From 600,000 to 800,000 skins, principally from the Rio de la Plata, are now annually imported into Great Britain. It is also very extensively used on the continent. Geoffroy mentions, that in certain years, a single French furrier (M. Bechem,) has received from 15,000 to 20,000 skins. The _coypou_ or _quoiya_ is a native of South America, very common in the provinces of Chili, Buenos Ayres, and Tucuman, but more rare in Paraguay. In size it is less than the beaver, which it resembles in many points. The head is large and depressed, the ears small and rounded, the neck stout and short, the muzzle sharper than that of the beaver, and the whiskers very long and stiff. There are, as in the beaver, two incisor teeth, and eight molar, above and below--twenty teeth in all. The limbs are short. The fore feet have each five fingers not webbed, the thumb being very small: the hind feet have the same number of toes; the great toe and three next toes being joined by a web which extends to their ends, and the little toe being free, but edged with a membrane on its inner side. The nails are compressed, long, crooked, and sharp. The tail, unlike that of the beaver, is long, round, and hairy; but the hairs are not numerous, and permit the scaly texture of the skin in this part to be seen. The back is of a brownish red, which becomes redder on the flanks: the belly is of a dirty red. The edges of the lips and extremity of the muzzle are white. Like the beaver, the coypou is furnished with two kinds of fur; viz. the long ruddy hair which gives the tone of colour, and the brownish ash-coloured fur at its base, which, like the down of the beaver, is of such importance in hat-making, and the cause of the animal's commercial value. The habits of the coypou are much like those of most of the other aquatic rodent animals. Its principal food, in a state of nature, is vegetable. It affects the neighbourhood of water, swims perfectly well, and burrows in the ground. The female brings forth from five to seven; and the young always accompany her. The coypou is easily domesticated, and its manners in captivity are very mild. * * * * * NOTES OF A READER. * * * * * RECORDS IN THE TOWER OF LONDON. (_From the Edinburgh Review, just published._) [These stores are of invaluable interest, particularly with reference to the earlier and most obscure portions of our history.]