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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xiii 페이지
... all the parts of one whole ) happened like as if they were made for the sake of some- thing , these were preserved , having been appropriately constituted modern times has treated it in a scientific spirit was xiii HISTORICAL SKETCH.
... all the parts of one whole ) happened like as if they were made for the sake of some- thing , these were preserved , having been appropriately constituted modern times has treated it in a scientific spirit was xiii HISTORICAL SKETCH.
6 페이지
... whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and . varieties , if he make due allowance for our profound . ignorance in regard to the ...
... whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unexplained in regard to the origin of species and . varieties , if he make due allowance for our profound . ignorance in regard to the ...
8 페이지
... whole organisation or on certain . parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every case , as Professor Weis- mann has lately insisted , and as I ...
... whole organisation or on certain . parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every case , as Professor Weis- mann has lately insisted , and as I ...
15 페이지
... whole sub- ject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same ...
... whole sub- ject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same ...
21 페이지
... whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have been tamed , and that their blood , in some cases mingled together , flows in the veins of our do ...
... whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have been tamed , and that their blood , in some cases mingled together , flows in the veins of our do ...
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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