The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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... mammals , reptiles , and fishes strictly belong to their proper classes , though some of these old forms are in a slight degree less distinct from each other than are the typical members of the same groups at the present day , it would ...
... mammals , reptiles , and fishes strictly belong to their proper classes , though some of these old forms are in a slight degree less distinct from each other than are the typical members of the same groups at the present day , it would ...
414 페이지
... Mammals offer another and similar case . I have care- fully searched the oldest voyages , and have not found a single instance , free from doubt , of a terrestrial mammal ( excluding domesticated animals kept by the natives ) in ...
... Mammals offer another and similar case . I have care- fully searched the oldest voyages , and have not found a single instance , free from doubt , of a terrestrial mammal ( excluding domesticated animals kept by the natives ) in ...
415 페이지
... mammals on remote islands ? On my view this question can easily be answered ; for no terrestrial mammal can be transported across a wide space of sea , but bats can fly across . Bats have been seen wan- dering by day far over the ...
... mammals on remote islands ? On my view this question can easily be answered ; for no terrestrial mammal can be transported across a wide space of sea , but bats can fly across . Bats have been seen wan- dering by day far over the ...
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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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 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 variability variations varieties vary whole widely different wings young