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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390 페이지
... Glacial period , which , as we shall immediately see , affords a simple expla- nation of these facts . We have evidence of almost every conceivable kind , organic and inorganic , that , within a very recent geological period , central ...
... Glacial period , which , as we shall immediately see , affords a simple expla- nation of these facts . We have evidence of almost every conceivable kind , organic and inorganic , that , within a very recent geological period , central ...
397 페이지
... glacial period occurred about 240,000 years ago , and endured , with slight altera- tions of climate , for about 160,000 years . With respect to more ancient glacial periods , several geologists are con- vinced , from direct evidence ...
... glacial period occurred about 240,000 years ago , and endured , with slight altera- tions of climate , for about 160,000 years . With respect to more ancient glacial periods , several geologists are con- vinced , from direct evidence ...
400 페이지
... Glacial period , the southern hemisphere was actually warmer , throws any clear light on the present ap- parently inexplicable distribution of various organisms in the temperate parts of both hemispheres , and on the mountains of the ...
... Glacial period , the southern hemisphere was actually warmer , throws any clear light on the present ap- parently inexplicable distribution of various organisms in the temperate parts of both hemispheres , and on the mountains of the ...
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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