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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119 페이지
... whole class of mammals , or of certain members in this class , to the highest grade would not lead to their taking ... whole , may have advanced and be still advancing throughout the world , yet the scale will always present many degrees ...
... whole class of mammals , or of certain members in this class , to the highest grade would not lead to their taking ... whole , may have advanced and be still advancing throughout the world , yet the scale will always present many degrees ...
348 페이지
... whole group of species is generally a slower process than their production : if their appearance and disappearance be represented , as before , by a vertical line of varying thickness the line is found to taper more gradually at its ...
... whole group of species is generally a slower process than their production : if their appearance and disappearance be represented , as before , by a vertical line of varying thickness the line is found to taper more gradually at its ...
351 페이지
... whole families or orders , as of Trilobites at the close of the paleozoic period , and of Ammonites at the close of the secondary period , we must remember what has been already said on the probable wide intervals of time between our ...
... whole families or orders , as of Trilobites at the close of the paleozoic period , and of Ammonites at the close of the secondary period , we must remember what has been already said on the probable wide intervals of time between our ...
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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