The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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x 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 condensed ...
... 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 condensed ...
9 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 coun- try 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 coun- try and fed on nearly the same food , deviations of structure so strongly ...
11 페이지
... young ; whereas carnivorous birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we ...
... young ; whereas carnivorous birds , with the rarest ex- ceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same con- dition as in the most sterile hybrids . When , on the one hand , we ...
63 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 ...
80 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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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young