The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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215 페이지
... resemblance is necessary for the first start , we can understand how it is that the larger and higher animals do not ( with the exception , as far as I know , of one fish ) resemble for the sake of protection special objects , but only ...
... resemblance is necessary for the first start , we can understand how it is that the larger and higher animals do not ( with the exception , as far as I know , of one fish ) resemble for the sake of protection special objects , but only ...
235 페이지
... resemblance to some common object was in each case the foundation for the work of natural selection , since per- fected through the occasional preservation of slight variations which made the resemblance at all closer ; and this will ...
... resemblance to some common object was in each case the foundation for the work of natural selection , since per- fected through the occasional preservation of slight variations which made the resemblance at all closer ; and this will ...
444 페이지
... resemble the mimicked ; for he found that some of the forms of Leptalis which mimic so many other butterflies , varied ... resemblance being generation after generation eliminated , and only the others left to propagate their kind . " So ...
... resemble the mimicked ; for he found that some of the forms of Leptalis which mimic so many other butterflies , varied ... resemblance being generation after generation eliminated , and only the others left to propagate their kind . " So ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young