To the existing statistics of the colour of hair among criminals, taken as a whole, it is not possible at present to attach much value. There is no uniform system of description and nomenclature; it is difficult to make full allowance for ethnic divergence, and there rarely exists an adequate standard of comparison for the normal persons of corresponding race. Of 129 persons “wanted” at Scotland Yard, I find that 45 have “dark brown” hair, and of these 17 (_i.e._, 37.7 per cent.) are described as “dangerous,” “desperate,” “expert,” or “notorious”; 46 have “brown” hair, and of these 14 (_i.e._, 30 per cent.) are “dangerous,” etc.; 11 are “dark” (9) or “black” (2), and of these 3 (_i.e._, 27.2 per cent.) are “dangerous”; 27 are described as “light brown,” “light,” “sandy,” “fair,” “auburn” (one, a woman), “red” (one, a man, who is “dangerous”), and of these 9 (_i.e._, 33.3 per cent.) are “dangerous,” etc. This gives a proportion of red-haired persons about the same, according to my observations, as is found among middle-class men in the city, but considerably lower than is found, according to Dr. Beddoe, the chief authority on this subject (in his _Races of Britain_), among the lower classes in London--_i.e._, about 4 per cent. This is the class from which the criminals in question were chiefly drawn, but they do not exclusively belong to London; many come from the northern towns, and in many of these, Leeds, for instance,[28] according to my observations, the proportion of red-haired persons is decidedly larger than in London, and certainly not smaller. It is interesting to compare these statistics of the hair of London criminals with a body of statistics concerning the colour of the hair of 1220 insane persons (omitting the grey-haired) in the New Brunswick Asylum; although as the racial mixture is certainly not quite identical, and the nomenclature probably varies, no strict comparison is possible. Of these 1220 insane persons the hair of 1050 is described as “dark,” “dark brown,” “brown,” while 170 have “light,” “auburn,” or “red” hair. One person in seven among the insane persons has fair hair, one in five among criminals; one person in fifty among the insane has red hair, one in 129 among the criminals; one in forty among the insane has auburn hair, one in 129 among the criminals. So that while the proportion of fair-haired is distinctly smaller among the insane, the proportion of red-haired and auburn-haired is very decidedly larger than among the criminals.