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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291 페이지
... follow , to a certain extent , as might have been expected , systematic affinity , by which term every kind of resemblance and dissimilarity between organic beings is attempted to be expressed . The facts by no means seem to indicate ...
... follow , to a certain extent , as might have been expected , systematic affinity , by which term every kind of resemblance and dissimilarity between organic beings is attempted to be expressed . The facts by no means seem to indicate ...
464 페이지
... follow from the following contingencies : namely , from the young having to provide at a very early age for their own wants , and from their following the same habits of life with their parents ; for in this case it would be in ...
... follow from the following contingencies : namely , from the young having to provide at a very early age for their own wants , and from their following the same habits of life with their parents ; for in this case it would be in ...
491 페이지
... follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into ... follows from the prin- ciple of natural selection ; for old forms are supplanted by new and improved forms . Neither ...
... follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into ... follows from the prin- ciple of natural selection ; for old forms are supplanted by new and improved forms . Neither ...
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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