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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127 페이지
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
... action of natural selection , and how much to the definite action of the conditions of life . Thus , it is well known to furriers that animals of the same species have thicker and better fur the further north they live ; but who can ...
243 페이지
... action follows another by a sort of rhythm ; if a person be inter- rupted in a song , or in repeating anything by rote , he is generally forced to go back to recover the habitual train of thought ; so P. Huber found it was with a ...
... action follows another by a sort of rhythm ; if a person be inter- rupted in a song , or in repeating anything by rote , he is generally forced to go back to recover the habitual train of thought ; so P. Huber found it was with a ...
245 페이지
... action for the sole good of another , with which I am acquainted , is that of aphides voluntarily yielding , as was first observed by Huber , their sweet excretion to ants : that they do so voluntarily , the following facts show : I re ...
... action for the sole good of another , with which I am acquainted , is that of aphides voluntarily yielding , as was first observed by Huber , their sweet excretion to ants : that they do so voluntarily , the following facts show : I re ...
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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