44개의 결과 중 1 - 5개
... of vision— Acelimatisation— Correlation of growth-- Compensation and
economy of growth — False correlations — Multiple, rudimentary, and lowly
organised structures variable — Parts developed in an unusual manner are
highly variable ...
... or in understanding how a simple being or a simple organ can be changed and
perfected into a highly developed being or elaborately constructed organ ;
secondly, the subject of Instinct, or the mental powers of animals ; thirdly,
The carrier, more especially the male bird, is also remarkable from the wonderful
develop ment of the carunculated skin above the head, and this is accompanied
by greatly elongated eyelids, very large external orifices to the nostrils, and a ...
Now, in every one of the domestic breeds, taking thoroughly well-bred birds, all
the above marks, even to the white edging of the outer tail-feathers, sometimes
concur perfectly developed. Moreover, when two birds bo longing to two distinct ...
He can never act by selection, excepting on variations which are first given to him
in some slight degree by nature. No man would ever try to make a fantail, till he
saw a pigeon with a tail developed in some slight degree in an unusual manner,
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