He extirpated the olfactory nerves of puppies, and found that as they grew the male was unable to distinguish the female.

Certain animals, such as the musk-ox, civet-cat, and beaver, possess glands on their sexual organs that secrete materials having a very strong odor.

Musk, a substance possessing the most penetrating odor and used in therapeutics, is obtained from the preputial follicles of the musk-deer of Thibet; and castor, a substance less penetrating, is obtained from the preputial sacs of the beaver.

Virgin moths (Bombyx) carried in boxes in the pockets of entomologists will on wide commons cause the appearance of males of the same species.
Bulimia is excessive morbid hunger, also called canine appetite.

While sometimes present in healthy people, it is most often seen in idiots and the insane, and is a symptom of diabetes mellitus.