On the head the hair is usually, on the contrary, abundant. Marro has observed a notable proportion of woolly-haired persons, a character very rarely found in normal individuals. The same character has been noted among idiots. In contrast with what is found among the insane, baldness is very rare. Among criminal women remarkable abundance of hair is frequently noted, and it has sometimes formed their most characteristic physical feature, accompanied by an unusual development of fine hair on the face and body. Salsotto, who has given special attention to criminal women, finds a considerable distribution of hair between the pubes and the umbilicus (as in men) in 10 per cent. of the forty women he examined as to this character; such distribution among normal women only occurring (according to Schulze) in 5 per cent. cases. Salsotto also found abundant hair in seven out of the forty around the anus, a part in normal women rarely supplied with hair. The excess of down on the face is found with special frequency in women guilty of infanticide. It is worth while pointing out that (as Dr. Langdon Down notes) there are frequent anomalies in the development of hair among idiots. Some are hirsute over the entire body; 11 per cent. have continuous eye-brows. This abundance of hair seems to be correlated with the animal vigour which is often so noticeable among criminals. It may at the same time be to some extent explained by arrest of development or atavism leading to the deficiency of beard which in its fully developed form marks, with few exceptions, only the highest human races. Strong sexual instincts are but the effervescence of this animal vigour; hence, perhaps, the connection between the presence of an unusual amount of hair and infanticide. In the case selected by Bucknill and Tuke as a typical example of insanity in women due to repressed sexual instinct, the chief physical characteristic noted was the amount of hair on the body; and in a case recorded by Dr. H. Sutherland (_West Riding Asylum Reports_, vol. vi.) of a girl whose illness and subsequent death were in his opinion due to “unsatisfied sexual desire,” the long fair hair, which she delighted in letting flow down to her knees, was specially noted. It was observed of the French writer, Restif de la Bretonne, of whose extraordinary and abnormal sexual proclivities, even at an early age, he has himself left ample evidence in his autobiographical book, _Monsieur Nicolas_, that his body was remarkably hairy.