William Bingley, Useful Knowledge: Volume 3. Animals
“ In ancient times the beaver is supposed to have been found wild in this country, and its skin was so valuable as to constitute the chief and most valuable fur which the island produced. The hair is of two kinds, of which the upper is long and thick; and the lower, or that immediately next to the skin, is of dark brown colour, short, close-set, and as soft as down. In commerce a distinction is made betwixt fresh, dry, and fat beaver' skins. Of these the first are obtained from animals that are killed in the winter ”
