On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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xiv 페이지
... instance , cattle got their horns , and not for what they are used . It is rather a singular instance of the manner in which similar views arise at about the same time , that Goethe in Germany , Dr. Darwin in England , and Geoffroy ...
... instance , cattle got their horns , and not for what they are used . It is rather a singular instance of the manner in which similar views arise at about the same time , that Goethe in Germany , Dr. Darwin in England , and Geoffroy ...
7 페이지
... instances ) , yet having their reproductive system so seriously affected by unperceived causes as to fail to act , we ... instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily affected ...
... instances ) , yet having their reproductive system so seriously affected by unperceived causes as to fail to act , we ... instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily affected ...
8 페이지
... instance , buds on peach - trees producing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the conditions is of subordinate importance in comparison with the nature of the organism in ...
... instance , buds on peach - trees producing nectarines , and buds on common roses producing moss - roses - we clearly see that the nature of the conditions is of subordinate importance in comparison with the nature of the organism in ...
12 페이지
... instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly , were the offspring of any single species . then such facts would have great weight in ...
... instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly , were the offspring of any single species . then such facts would have great weight in ...
17 페이지
... instance , could a pouter be produced by crossing two breeds unless one of the parent - stocks possessed the characteristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , they did not breed ...
... instance , could a pouter be produced by crossing two breeds unless one of the parent - stocks possessed the characteristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , they did not breed ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young