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We have already seen that the nature of the change and the relation of the change of structure to the change of conditions necessarily tend to the inference that the latter is the cause of the former. But we have to consider the particular changes in detail. To take first the loss of pigmentation from the lower side.
When the latter occurs there would be no segregation and the heterozygote would breed true. The most interesting fact is that a given factor in the cases I have described, namely, colour of plumage and pigmentation, of skin in the Jungle fowl and the Silky, is not a permanent and indivisible unit, but is capable of subdivision in any proportion.
The pigmentation resembles the bronzing of Addison's disease, but there are no patches on the mucous membranes, and the normal rosy tint of the lips is not altered. The skin over the feet may show marked hyperkeratosis. The nervous system is notably affected.
Upon its face were stamped countless wrinkles and its blackness seemed less that of pigmentation than the weathering of unbelievable years, the very stain of ancientness. And about neither face nor figure was there anything to show whether it was man or woman. From the twisted shoulders a short and sleeveless red tunic fell.
Within a few weeks, if all goes well, the muscles regain their "tone." Coincidently, the excessive fat over the abdomen is absorbed. The skin becomes smooth, and its pigmentation fades completely; but the pregnancy streaks rarely vanish entirely, although they always become very much less noticeable.
Minor degrees of the abnormality occur: in Turbot with the hook-like projection of the dorsal fin the lower side of the head is often without pigment, while the rest of the lower side is pigmented. Less degrees of pigmentation of the lower side occur without structural abnormality of the eye and dorsal fin. There is no evidence that these abnormalities are due to abnormal conditions of life.
"It is nothing," I assured him. "It is only pigmentation caused er caused by some harmless germ." "I know what it is," cried Alice suddenly. "It's the Blue Disease. Father, you remember the Perrys were telling us about it yesterday at lunch. They said it was all over Birmingham, and that they had come south partly to escape it. They must have brought the infection with them."
It is most active during the hot weather, the inflammation subsiding in the winter, leaving a pigmentation of the skin. Each year the symptoms become more alarming, nervous disorders finally setting in, and a large number die insane. The disease is most prevalent in the country. In the towns, where maize is supplemented by other articles of food, it does not exist.
His gray skin, because of its lack of pigmentation, was splotched with eczema; his wool was a dirty, yellowish white; his features were permanently distorted because of his lifelong efforts to keep the light from paining his pink eyes. The askaris threw this monstrosity upon his face before Lilla's chair. He lay moaning and feebly moving his hands, as if he were caressing the earth.
Development of the Secondary Sexual Characters. Deep Voice. Bright Eyes. Glandular Activity. Everted Lips. Pigmentation. Profuse Hair. Dubious Significance of Many of These Characters. The Relationship of Maternal and Sexual Emotion. Conception and Loss of Virginity. The Anciently Accepted Signs of This Condition. The Pervading Effects of Pregnancy on the Organism. Pigmentation.
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