Richelot observed white mottling of hair in a girl sick with chlorosis. The whitening extended from the roots to a distance of two inches. The probable cause was a temporary alteration of the pigment-forming function. When the chlorosis was cured the natural color returned. Paullini and Riedlin, as well as the Ephemerides, speak of different colored hair in the same head, and it is not at all rare to see individuals with an anomalously colored patch of hair on the head. The members of the ancient house of Rohan were said to possess a tuft of white hair on the front of their heads. Michelson of Konigsberg describes a curious case in a barrister of twenty-three affected with partial canities. In the family of both parents there was stated to be congenital premature canities, and some white hairs had been observed even in childhood. In the fifteenth year, after a grave attack of scarlet fever, the hair to a great extent fell out. The succeeding growth of hair was stated to have been throughout lighter in tissue and color and fissured at the points. Soon after bunches of white hair appeared on the occiput, and in the succeeding years small patches of decolored hairs were observed also on the anterior and lateral portions of the scalp. In the spring of 1880 the patient exhibited signs of infiltration of the apex of the right lung, and afterward a violent headache came on. At the time of the report the patient presented the appearance shown in Figure 89. The complexion was delicate throughout, the eyelashes and eyelids dark brown, the moustache and whiskers blond, and in the latter were a few groups of white hair. The white patches were chiefly on the left side of the head. The hairs growing on them were unpigmented, but otherwise normal. The patient stated that his head never sweated. He was stout and exhibited no signs of internal disease, except at the apex of the right lung.