The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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62개의 결과 중 1 - 5개
xii 페이지
... young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids ' not having been acquired through natural selection ...
... young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids ' not having been acquired through natural selection ...
6 페이지
... young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly ...
... young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly ...
7 페이지
... young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see ...
... young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see ...
38 페이지
... young naturalist commences the study of a group of organisms quite unknown to him , he is at first much perplexed in determining what differences to consider as specific , and what as varietal ; for he knows nothing of the amount and ...
... young naturalist commences the study of a group of organisms quite unknown to him , he is at first much perplexed in determining what differences to consider as specific , and what as varietal ; for he knows nothing of the amount and ...
47 페이지
... young in the interval , and surviving till one hundred years old ; if this be so , after a period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better ...
... young in the interval , and surviving till one hundred years old ; if this be so , after a period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young