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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368 페이지
... marsupials should have been chiefly or solely produced in Australia ; or that Edentata and other American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ...
... marsupials should have been chiefly or solely produced in Australia ; or that Edentata and other American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ...
447 페이지
... Marsupial , which will naturally have been more or less intermediate in character with respect to all existing Mursupials ; or that both Rodents and Marsupials branched off from a common progenitor , and that both groups have since ...
... Marsupial , which will naturally have been more or less intermediate in character with respect to all existing Mursupials ; or that both Rodents and Marsupials branched off from a common progenitor , and that both groups have since ...
530 페이지
... Marsupials of Australia , 106 . - , structure of their feet , 450 . Marsupials , fossil species of , 367 . Martens , M. , experiment on seeds , 384 . Martin , Mr. W. C. , on striped mules , 153 . Masters , Dr. , on Saponaria , 207 ...
... Marsupials of Australia , 106 . - , structure of their feet , 450 . Marsupials , fossil species of , 367 . Martens , M. , experiment on seeds , 384 . Martin , Mr. W. C. , on striped mules , 153 . Masters , Dr. , on Saponaria , 207 ...
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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