The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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xi 페이지
... origin to a great first Creative Cause . " If we interpret these sentences given in the same address , one by the other , it appears that this eminent philosopher felt in 1858 his confidence shaken that the Apteryx and the Red Grouse ...
... origin to a great first Creative Cause . " If we interpret these sentences given in the same address , one by the other , it appears that this eminent philosopher felt in 1858 his confidence shaken that the Apteryx and the Red Grouse ...
16 페이지
... origin of most of our domestic animals will prob- ably forever remain vague . But I may here state that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the ...
... origin of most of our domestic animals will prob- ably forever remain vague . But I may here state that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the ...
268 페이지
... origin of instincts that " the variations of structure and of instinct must have been simultaneous and accurately adjusted to each other , as a modification in the one without an immediate corresponding change in the other would have ...
... origin of instincts that " the variations of structure and of instinct must have been simultaneous and accurately adjusted to each other , as a modification in the one without an immediate corresponding change in the other would have ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable 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 occasionally 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 variability variations varieties vary whole widely different wings young