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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79개의 결과 중 1 - 5개
xxi 페이지
... whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Introduction to the Australian Flora . ' In the first part of this great work he admits the truth of the descent and modification of ...
... whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Introduction to the Australian Flora . ' In the first part of this great work he admits the truth of the descent and modification of ...
4 페이지
... whole work , and a few concluding remarks . No one ought to feel surprise at much remaining as yet unex . plained 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 unex . plained in regard to the origin of species and varieties , if he make due allowance for our profound ignorance in regard to the ...
5 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 Weismann has lately insisted , and as I have ...
... 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 Weismann has lately insisted , and as I have ...
9 페이지
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
12 페이지
... whole amount of difference between the several breeds of the dog has been produced under domestication ; I believe that a small part of the difference is due to their being descended from distinct species . In the case of strongly ...
... whole amount of difference between the several breeds of the dog has been produced under domestication ; I believe that a small part of the difference is due to their being descended from distinct species . In the case of strongly ...
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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