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Microscopically examined, the pigmentation was found to consist of black and orange chromatophores exactly similar to those of the upper side. Some hundreds of young Flounders were reared at the same time under ordinary conditions and none of them developed pigment.
Davenport has concluded that there are two double factors for black pigmentation in the full-blooded negro which are separately inheritable. The determinants of the red and yellow have still to be worked out. The moistness of the skin, as perspiration, depends upon the number and activity of the sweat glands.
Pregnancy constantly gives rise to pigmentation of the face, the neck, the nipples, the abdomen, and this is especially marked in brunettes. This association of pigmentation and sexual aptitudes has been recognized in the popular lore of some peoples.
About twenty years ago, however, Von Schmaedel propounded the theory that pigmentation in the hair, eyes and skin was Nature's way of protecting the tissues from injury by the actinic or ultra-violet rays of the sun, which destroy protoplasm.
So the gland of energy for emergencies writes its signature always all over the skin. In an adrenal personality, the epidermis is always slightly, somewhat, or deeply pigmented. The pigmentation is due to a dark brown deposit lightly or thickly scattered over the skin.
The existence of accidental nigrities rests on well-established facts which are distinctly different from the pigmentation of purpura, icterus, or that produced by metallic salts. Chomel quotes the case of a very apathic old soldier, whose skin, without any appreciable cause, became as brown as that of a negro in some parts, and a yellowish-brown in others.
But when we consider the pigmentation of the upper side and the normally white lower side, although the adaptation is equally obvious, the utility is by no means certain.
He had to sit by while an extremely self-confident young Darian doctor named Korvan rather condescendingly demonstrated that the former blue pigmentation was a viral product quite unconnected with the plague, and that it had been wiped out by a very trivial epidemic of such and such. Calhoun regarded that young man with a detached interest.
The Available Standards of Comparison Characteristics of the Castrated Characteristics of Puberty Characteristics of the State of Detumescence Shortness of Stature Development of the Secondary Sexual Characters Deep Voice Bright Eyes Glandular Activity Everted Lips Pigmentation Profuse Hair Dubious Significance of Many of These Characters.
Speculation as to the marked differences in pigmentation and appearance of niece and uncle was dissipated by my consciousness that we were now moving in a dim half-light. We were in a fairly wide tunnel. Not far ahead the gleam filtered, pale yellow like sunlight sifting through the leaves of autumn poplars.
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