On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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xvii 페이지
... colour of this vigorous race I take for granted , from what has been already said , would be dark . But the same disposition to form varieties still existing , a darker and a darker race would in the course of time occur ; and as the ...
... colour of this vigorous race I take for granted , from what has been already said , would be dark . But the same disposition to form varieties still existing , a darker and a darker race would in the course of time occur ; and as the ...
8 페이지
... colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act ...
... colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act ...
12 페이지
... that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf . Colour and 12 CHAP . I. VARIATION.
... that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf . Colour and 12 CHAP . I. VARIATION.
13 페이지
... Colour and constitutional peculiarities go together , of which many remarkable cases could be given amongst animals ... coloured individuals escape : Professor Wyman has recently communicated to me a good illustration of this fact ; on ...
... Colour and constitutional peculiarities go together , of which many remarkable cases could be given amongst animals ... coloured individuals escape : Professor Wyman has recently communicated to me a good illustration of this fact ; on ...
27 페이지
... colour , with the white loins , double black wing - bar , and barred and white - edged tail- feathers , as any wild ... coloured and marked like the rock - pigeon , although no other existing species is thus coloured and marked , so that ...
... colour , with the white loins , double black wing - bar , and barred and white - edged tail- feathers , as any wild ... coloured and marked like the rock - pigeon , although no other existing species is thus coloured and marked , so that ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely