The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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193 페이지
... perfect as , or slightly more perfect than the other in- habitants of the same country with which it comes into com- petition . And we see that this is the standard of perfec- tion attained under nature . The endemic productions of New ...
... perfect as , or slightly more perfect than the other in- habitants of the same country with which it comes into com- petition . And we see that this is the standard of perfec- tion attained under nature . The endemic productions of New ...
285 페이지
... perfect fertility . It is surprising in how many curious ways this gradation can be shown ; but only the barest outline of the facts can here be given . When pollen from a plant of one family is placed on the stigma of a plant of a ...
... perfect fertility . It is surprising in how many curious ways this gradation can be shown ; but only the barest outline of the facts can here be given . When pollen from a plant of one family is placed on the stigma of a plant of a ...
468 페이지
... perfect pistils are essentially alike in nature . An animal may possess vari- ous parts in a perfect state , and yet they may in one sense be rudimentary , for they are useless : thus the tadpole of the common salamander or water - newt ...
... perfect pistils are essentially alike in nature . An animal may possess vari- ous parts in a perfect state , and yet they may in one sense be rudimentary , for they are useless : thus the tadpole of the common salamander or water - newt ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young