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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340 페이지
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as ex- tensive as the land , we see them studded with ...
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as ex- tensive as the land , we see them studded with ...
393 페이지
... land from western Europe through Siberia , to eastern America . And this continuity of the circumpolar land , with the conse- quent freedom under a more favorable climate for inter- migration , will account for the supposed uniformity ...
... land from western Europe through Siberia , to eastern America . And this continuity of the circumpolar land , with the conse- quent freedom under a more favorable climate for inter- migration , will account for the supposed uniformity ...
534 페이지
... land - shells , 417 . Salter , Mr. , on early death of hybrid embryos , 293 . Saurophagus sulphuratus , 168 . Schacht , Prof. , on Phyllotaxy , 205 . Schiödte , on blind insects , 131 . on flat - fish , 220 . Schlegel , on snakes , 137 ...
... land - shells , 417 . Salter , Mr. , on early death of hybrid embryos , 293 . Saurophagus sulphuratus , 168 . Schacht , Prof. , on Phyllotaxy , 205 . Schiödte , on blind insects , 131 . on flat - fish , 220 . Schlegel , on snakes , 137 ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable 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 occasionally 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