The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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13 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 Saint ...
... 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 Saint ...
35 페이지
... instances ) , yet having their reproductive sys- tem 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 sys- tem 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 ...
41 페이지
... instance , of the cabbage , in very poor soil ( in which case , however , some effect would have to be attributed to the definite action of the poor soil ) , that they would , to a large extent , or even wholly , revert to the wild ...
... instance , of the cabbage , in very poor soil ( in which case , however , some effect would have to be attributed to the definite action of the poor soil ) , that they would , to a large extent , or even wholly , revert to the wild ...
43 페이지
... instance , it could be shown that the grey . hound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly , were the off- spring of any single species , then such facts would have great weight ...
... instance , it could be shown that the grey . hound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly , were the off- spring of any single species , then such facts would have great weight ...
50 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 animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological 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 male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young