Alibert and Beigel relate cases of women with blond hair which all came off after a severe fever (typhus in one case), and when it grew again it was quite black. Alibert also saw a young man who lost his brown hair after an illness, and after restoration it became red. According to Crocker, in an idiotic girl of epileptic type (in an asylum at Edinburgh), with alternating phases of stupidity and excitement, the hair in the stupid phase was blond and in the excited condition red. The change of color took place in the course of two or three days, beginning first at the free ends, and remaining of the same tint for seven or eight days. The pale hairs had more air-spaces than the darker ones. There was much structural change in the brain and spinal cord. Smyly of Dublin reported a case of suppurative disease of the temporal bone, in which the hair changed from a mouse-color to a reddish-brown; and Squire records a congenital case in a deaf mute, in whom the hair on the left side was in light patches of true auburn and dark patches of dark brown like a tortoise-shell cap; on the other side the hair was a dark brown. Crocker mentions the changes which have occurred in rare instances after death from dark brown to red. Chemic colorations of various tints occur. Blue hair is seen in workers in cobalt mines and indigo works; green hair in copper smelters; deep red-brown hair in handlers of crude anilin; and the hair is dyed a purplish-brown whenever chrysarobin applications used on a scalp come in contact with an alkali, as when washed with soap. Among such cases in older literature Blanchard and Marcellus Donatus speak of green hair; Rosse saw two instances of the same, for one of which he could find no cause; the other patient worked in a brass foundry. Many curious causes are given for alopecia. 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. Some savage tribes have long and thick nails resembling the claws of beasts, and use them in the same way as the lower animals. There is a description of a person with finger-nails that resembled the horns of a goat.