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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33 페이지
... slight in internal parts or organs . Man can hardly select , or only with much difficulty , any deviation of ... 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 ...
... slight in internal parts or organs . Man can hardly select , or only with much difficulty , any deviation of ... 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 ...
58 페이지
... slight and from whatever cause proceeding , if they be in any degree profitable to the individuals of a species , in their infinitely complex relations to other organic beings and to their physical conditions of life , will tend to the ...
... slight and from whatever cause proceeding , if they be in any degree profitable to the individuals of a species , in their infinitely complex relations to other organic beings and to their physical conditions of life , will tend to the ...
244 페이지
... slight modifications of instinct might be profitable to a species ; and if it can be shown that instincts do vary ... slight deviations of bodily structure . No complex instinct can possibly be produced through natural selection , except ...
... slight modifications of instinct might be profitable to a species ; and if it can be shown that instincts do vary ... slight deviations of bodily structure . No complex instinct can possibly be produced through natural selection , except ...
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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