The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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xiii 페이지
... hand , have believed that species undergo modification , and that the existing forms of life are the descendants by true generation of pre - existing forms . Passing over allusions to the sub- ject in the classical writers , * the first ...
... hand , have believed that species undergo modification , and that the existing forms of life are the descendants by true generation of pre - existing forms . Passing over allusions to the sub- ject in the classical writers , * the first ...
xxvi 페이지
... hand , we view Persistent Types ' in relation to that hypothesis which supposes the species living at any time to be the result of the gradual modification of pre - existing species a hypothesis which , though un- proven , and sadly ...
... hand , we view Persistent Types ' in relation to that hypothesis which supposes the species living at any time to be the result of the gradual modification of pre - existing species a hypothesis which , though un- proven , and sadly ...
8 페이지
... hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either definite or indefinite . They may be considered as defi- nite when all or nearly all the offspring of ...
... hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either definite or indefinite . They may be considered as defi- nite when all or nearly all the offspring of ...
11 페이지
... hand , we see domesticated animals and plants , though often weak and sickly , breeding freely under confinement ; and when , on the other hand , we see individuals , though taken young from a state of nature perfectly tamed , long ...
... hand , we see domesticated animals and plants , though often weak and sickly , breeding freely under confinement ; and when , on the other hand , we see individuals , though taken young from a state of nature perfectly tamed , long ...
46 페이지
... hand , nurserymen , from keeping large stocks of the same plant , are generally far more successful than amateurs in raising new and valuable varieties . A large number of individuals of an animal or plant can be reared only where the ...
... hand , nurserymen , from keeping large stocks of the same plant , are generally far more successful than amateurs in raising new and valuable varieties . A large number of individuals of an animal or plant can be reared only where the ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young