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The epidermis is therefore growing while the spermatogenesis is taking place. In August and September the epidermic papillae begin to be obvious, and from this time till February a continuous increase in the papillae and their pigmentation occur. Geoffrey Smith argues that the development of this somatic character occurs while the testes are inactive and unchanged.
The various races of the earth enjoy a degree of pigmentation of the skin corresponding to the intensity of the sunlight in the latitude to which they have become accustomed through the course of evolution. Equatorial races are black, far-northern races are blonde with very fair skin, and those occupying mean latitudes are either brown or olive-hued.
The disease began suddenly in the woman, but gradually in the man. Crocker has reported a case somewhat similar to these two, under the head of general bronzing without constitutional symptoms, in a Swedish sailor of twenty-two, with rapid onset of pigmentation.
Even leaving out of account the wedding apparel of animals, nearly always gorgeous in scales and plumage and hair, the sexual orifice shows a more or less marked tendency to pigmentation during the breeding season from fishes upward, while in mammals the darker pigmentation of this region is a constant phenomenon in sexually mature individuals.
Acanthosis Nigricans may be defined as a general pigmentation with papillary mole-like growths. In the "International Atlas of Rare Skin Diseases" there are two cases pictured, one by Politzer in a woman of sixty-two, and the other by Janovsky in a man of forty-two. The regions affected were mostly of a dirty-brown color, but in patches of a bluish-gray.
The deposits are especially frequent, as I have mentioned, in the middle line of the abdomen, on account of the arrangement of the blood vessels there. Deposits elsewhere may depend upon other conditions; but whatever their cause the pigmentation vanishes a short time after the birth.
People who have never been outside Europe can hardly imagine the intensity of the colour prejudice that white men develop when brought into contact with any different pigmentation. The Japanese are not treated in this way, because they have a powerful army and navy.
The noted anthropologist Havelock Ellis says, in regard to this: "It is clear that a high index of pigmentation, or an excess of fairness, prevails among the men of restless and ambitious temperament; the sanguine, energetic men; the men who easily dominate their fellows and who get on in life, and the men who recruit the aristocracy and who doubtless largely form the plutocracy.
Strangest of all, a phenomenon most marked in the children, Allan noticed that after a few weeks under the altered conditions of food and exposure to the actinic rays of the sun as reflected by the moonlight, pigmentation began to develop. A certain clouding of the iris began to show, premonitory of color-deposit.
The chief abnormal features are pigmentation of the lower side as well as of the upper, the eye of the lower side, left or right according to the species, on the edge of the head instead of the upper side, and the dorsal fin with its attachment ceasing behind this eye, the end of the fin projecting freely forwards over the eye in the form of a hook.
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