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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158 페이지
... habits of life— Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of ...
... habits of life— Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of ...
167 페이지
... habits , in the individuals of the same species . In either case it would be easy for natural selec- tion to adapt the structure of the animal to its changed habits , or exclusively to one of its several habits . It is , however ...
... habits , in the individuals of the same species . In either case it would be easy for natural selec- tion to adapt the structure of the animal to its changed habits , or exclusively to one of its several habits . It is , however ...
169 페이지
... habits of this genus , that a Mexican Colaptes has been described by De Saussure as boring holes into hard wood in order to lay up a store of acorns . Petrels are the most aërial and oceanic of birds , but , in the quiet sounds of ...
... habits of this genus , that a Mexican Colaptes has been described by De Saussure as boring holes into hard wood in order to lay up a store of acorns . Petrels are the most aërial and oceanic of birds , but , in the quiet sounds of ...
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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