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The effects, moreover, of the definite action of the conditions of life, will not have been masked in the females, as in the males, by the accumulation through sexual selection of strongly-pronounced colours and other ornaments. The individuals of both sexes, however affected, will have been kept at each successive period nearly uniform by the free intercrossing of many individuals.
Some three years ago Sir Arthur Evans discovered in the palace of the ancient Kings of Crete coloured frescoes some 3,500 years old representing in great detail elegant young women with greatly compressed waists, strongly-pronounced bustles, and elaborately ornamented skirts.
We may therefore conclude that some early progenitor of the Ardea asha and the Buphus acquired a white plumage for nuptial purposes, and transmitted this colour to their young; so that the young and the old became white like certain existing egrets; and that the whiteness was afterwards retained by the young, whilst it was exchanged by the adults for more strongly-pronounced tints.
His strongly-pronounced jawbones, large teeth and firm chin, lent him an expression of will-power and energy; the thin-lipped large mouth and the clear, gray, steady eyes commanded respect and marked the man who would not let himself be imposed upon or put out of countenance; his eyes twinkled at the slightest occasion with an expression of subtle roguishness, evidence of the general American inclination for jesting and joking.
He grew to manhood without having acquired much in the way of education, but the quickness of his parts and the soundness of his judgment did much to atone for his want of regular school training. He began to take an active interest in public affairs at an early age, and before he was thirty he had acquired wide notoriety as a strongly-pronounced Reformer.
It is therefore probable that with tree-haunting birds, strongly-pronounced colours have been acquired through sexual selection, but that a green tint has been acquired oftener than any other, from the additional advantage of protection. In regard to birds which live on the ground, every one admits that they are coloured so as to imitate the surrounding surface.
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