Note 1802 — BOOK VIII. THE NATURE OF THE TERRESTRIAL ANIMALS.

Pliny here adopts the vulgar opinion respecting the origin of the substance called “castor,” and in B. xxxii. c. 13, gives a more correct description, which he had derived from a physician, named Sextius. It is a fetid, oily substance, secreted by a gland situate near the prepuce. Cuvier remarks, that when the gland becomes distended with this secretion, the animal may probably get rid of it by rubbing the part against a stone or tree, and in this way, leave the castor for the hunters, thus giving rise to the vulgar error. Ajasson, vol. vi. p. 448; Lemaire, vol. iii. p. 440.—B.