The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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216 페이지
... respect to the baleen , Mr. Mivart remarks that if it had once attained such a size and development as to be at all useful , then its preservation and augmentation within serviceable limits would be promoted by natural selection alone ...
... respect to the baleen , Mr. Mivart remarks that if it had once attained such a size and development as to be at all useful , then its preservation and augmentation within serviceable limits would be promoted by natural selection alone ...
424 페이지
... respect to the many 2 curious means of occasional transport - if we bear in mind , and this is a very important consideration , how often a species may have ranged continuously over a wide area , and then have become extinct in the ...
... respect to the many 2 curious means of occasional transport - if we bear in mind , and this is a very important consideration , how often a species may have ranged continuously over a wide area , and then have become extinct in the ...
482 페이지
... respect to the absence of strata rich in fossils be- neath the Cambrian formation , I can recur only to the hypothesis given in the tenth chapter ; namely , that though our continents and oceans have endured for an enormous period in ...
... respect to the absence of strata rich in fossils be- neath the Cambrian formation , I can recur only to the hypothesis given in the tenth chapter ; namely , that though our continents and oceans have endured for an enormous period in ...
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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