Scientists consider the hair a particularly distinguishing feature among the races of men, not only in regard to its colour, but also as to its texture.

In fact, the human race is by some classified according to the character of the hair of the head.

Compared under the microscope a section of the hair of a Chinaman or an American Indian is found to be circular, that of a European oval in shape.

As a rule, the flatter the hair the more readily it curls, the perfectly cylindrical hair hanging down stiff and straight.

A section of the straight hair of a Japanese, for instance, forms a perfect circle.