One of the principal characters which distinguishes the human animal from the lower orders is the absence of a natural covering for the skin. That mankind have descended from hair-covered progenitors is the inevitable conclusion of all those who accept the theory of the evolution of species, the straggling hairs which are scattered over the body of man being the rudiments of a uniform hairy coat which enveloped his ancestors.

We are informed that a hairy covering for the body, pointed ears which were capable of movement, and a tail provided with the proper muscles, were among the undoubted characters of the antecedents of the human race. In addition to these, among the males, were developed great canine teeth which were used as weapons against their rivals.

As the lack of a hairy coat for the body constitutes one of the principal characteristics which distinguishes man from the lower animals, it would seem that a knowledge of the order of time in which the two sexes became divested of their natural covering would serve as a hint to indicate their relative stages of development. In a paper read some years ago at a meeting of the Anthropological Institute in London, Miss Bird (Mrs. Bishop) the well-known traveller, gave a description of the Ainos, a race of people found chiefly in the island of Yezo, and who, it is thought probable, were the original inhabitants of Japan. The peculiarity of this people is, that the men are covered with a thick coat of black hair. The women, we are told, “are not hairy like the men,” but “have soft brown skins.” Upon this subject of hairiness, Mr. Darwin says:

As the body of woman is less hairy than that of man, and as this character is common to all races, we may conclude that it was our female semi-human ancestors who were first divested of hair, and that this occurred at an extremely remote period before the several races had diverged from a common stock.

After our female ancestors had acquired the new character, nudity, they must have transmitted it to their own sex, and by continually selecting their mates from among the least hairy, in process of time males too would become divested of their animal covering. Whether or not our semi-human ancestors were subjected to the scorching heat of the torrid zone, nudity must have been better suited to their improved condition, not wholly, however, because of its greater beauty and comfort, but because it was a condition better suited to cleanliness; and, as the hairy coat had become a useless appendage, or was not necessary to their changed conditions, it disappeared from the bodies of females, while doubtless for ages it was retained upon the bodies of males. That hairiness denotes a low stage of development, Mr. Darwin incautiously admits, yet in dealing with this subject he is not disposed to carry his admission to its legitimate conclusion by treating its appearance on the body of man as a test in determining the comparative development of the female and male organisms.

Idiots, who, by the way, are more numerous among males than among females, are frequently covered with hair, and by the acquirement of other characters more often revert to lower animal types. Mr. Darwin assures us that around sores of long standing stiff hairs are liable to appear, thus showing that hair on the body is indicative of undeveloped tissues and low constitutional conditions. The same writer, however, does not neglect to inform us that the loss of man’s hairy covering was rather an injury to him than otherwise; but whether or not the diminution in the quality of prehension in his toes, the loss of his canines, and the disappearance of his tail have likewise proved detrimental to him, Mr. Darwin fails to state.

The fact that throughout the vertebrate kingdom males possess rudiments of the various parts appertaining to the reproductive system which properly belong to females, is regarded as evidence that some remote progenitor of this kingdom must have been hermaphrodite, or androgynous, especially as it has been ascertained that at a very early embryonic period both sexes possess true male and female glands. As high in the scale of life as the mammalian class, males are said to possess rudiments of a uterus, while at the same time mammary glands are plainly manifest; which fact would seem to show that in the high state of development indicated by this great class, male organs have not through the processes of differentiation become specialized for the performance of their legitimate functions. In reference to the subject of atavism Mr. Darwin cites as a case of reversion to a former type, an instance in which a man was the possessor of two pairs of mammæ.

It is true that instances have been observed in which characters peculiar to males have been developed in females. This phenomenon, however, seldom appears among individuals of the higher orders, and among the lower forms of life where it occurs, it is always manifested under low circumstances of nutrition or in cases of old age, disease, or loss of vitality. Instances are cited in which hens, after they have become old or diseased, have taken on characters peculiar to males.

In all “old-settled” countries women are in excess of men, and this is true, notwithstanding the fact that more boys are born than girls. Regarding the excess of the male over female births, Mr. Darwin quotes from Professor Faye, who says:

A still greater preponderance of males would be met with, if death struck both sexes in equal proportion in the womb and during birth. But the fact is, that for every one hundred still-born females, we have in several countries from 134.6 to 144.9 still-born males.[35]