The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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43 페이지
... naturalists do not like to rank them as distinct species , are in several respects the most important for us . We ... naturalists having sound judgment and wide experience seems the only guide to follow . We must , however , in many ...
... naturalists do not like to rank them as distinct species , are in several respects the most important for us . We ... naturalists having sound judgment and wide experience seems the only guide to follow . We must , however , in many ...
329 페이지
... naturalists to be identical with existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specific- ally distinct , though the distinction is admitted to be very slight ...
... naturalists to be identical with existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specific- ally distinct , though the distinction is admitted to be very slight ...
435 페이지
... naturalists as only a genus , and then raised to the rank of a subfamily or family ; and this has been done , not be- cause further research has detected important structural differences , at first overlooked , but because numerous ...
... naturalists as only a genus , and then raised to the rank of a subfamily or family ; and this has been done , not be- cause further research has detected important structural differences , at first overlooked , but because numerous ...
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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