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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322 페이지
... successive oscillations of level , as well as the subsequent subaerial degradation . Such thick and extensive accumulations of sediment may be formed in two ways ; either in profound depths of the sea , in which case the bottom will not ...
... successive oscillations of level , as well as the subsequent subaerial degradation . Such thick and extensive accumulations of sediment may be formed in two ways ; either in profound depths of the sea , in which case the bottom will not ...
346 페이지
... successive varia- tions would almost certainly be in some degree different , and the newly - formed variety would probably inherit from its progenitor some characteristic differences . Groups of species , that this , genera and families ...
... successive varia- tions would almost certainly be in some degree different , and the newly - formed variety would probably inherit from its progenitor some characteristic differences . Groups of species , that this , genera and families ...
352 페이지
... successive palæozoic formations of Russia , Western Europe , and North America , a similar parallelism in the forms of life has been observed by several authors ; so it is , according to Lyell , with the European and North American ...
... successive palæozoic formations of Russia , Western Europe , and North America , a similar parallelism in the forms of life has been observed by several authors ; so it is , according to Lyell , with the European and North American ...
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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