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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7 페이지
... appear to act in two ways- directly on the whole organization or on certain parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every case , as Professor ...
... appear to act in two ways- directly on the whole organization or on certain parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every case , as Professor ...
12 페이지
... appear only in the offspring when nearly mature ; peculiarities in the silk - worm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a ...
... appear only in the offspring when nearly mature ; peculiarities in the silk - worm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a ...
461 페이지
... appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
... appears in the parent , it tends to reappear at a corresponding age in the offspring . Certain vari- ations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
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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