The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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xvi 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 ...
9 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 ...
13 페이지
... Colour and con- stitutional peculiarities go together , of which many re- markable cases could be given amongst ... coloured individuals escape : Professor Wy- man has recently communicated to me a good illustra- tion of this fact ; on ...
... Colour and con- stitutional peculiarities go together , of which many re- markable cases could be given amongst ... coloured individuals escape : Professor Wy- man has recently communicated to me a good illustra- tion of this fact ; on ...
29 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 ...
... 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 ...
30 페이지
... - appearance of the blue colour and various black marks in all the breeds , both when kept pure and when crossed ; and lastly , the mongrel offspring being perfectly fertile ; -from these several reasons. 30 [ CHAP . I. DOMESTIC PIGEONS .
... - appearance of the blue colour and various black marks in all the breeds , both when kept pure and when crossed ; and lastly , the mongrel offspring being perfectly fertile ; -from these several reasons. 30 [ CHAP . I. DOMESTIC PIGEONS .
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young