The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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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 advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young