Gilibert and Merlet mention sexual excess; Marcellus Donatus gives fear; the Ephemerides speaks of baldness from fright; and Leo Africanus, in his description of Barbary, describes endemic baldness.

Neyronis makes the following observation: A man of seventy-three, convalescent from a fever, one morning, about six months after recovery perceived that he had lost all his hair, even his eyelashes, eyebrows, nostril-hairs, etc.

Although his health continued good, the hair was never renewed.
The principal anomalies of the nails observed are absence, hypertrophy, and displacement of these organs.

Some persons are born with finger-nails and toe-nails either very rudimentary or entirely absent; in others they are of great length and thickness.

The Chinese nobility allow their finger-nails to grow to a great length and spend much time in the care of these nails.