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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xix 페이지
... theory of Natural Selection ..... 158 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY SELECTION . OF NATURAL Longevity - Modifications not necessarily simultaneous - Modi- fications apparently of no direct service - Progressive ...
... theory of Natural Selection ..... 158 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY SELECTION . OF NATURAL Longevity - Modifications not necessarily simultaneous - Modi- fications apparently of no direct service - Progressive ...
158 페이지
Charles Darwin. CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life— Diversified habits in the same species ...
Charles Darwin. CHAPTER VI . DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life— Diversified habits in the same species ...
476 페이지
... theory of Natural Selection- Recapitulation of the general and special circumstances in its favor - Causes of the general belief in the immutability of species - How far the theory of Natural Selection may be extended - Effects of its ...
... theory of Natural Selection- Recapitulation of the general and special circumstances in its favor - Causes of the general belief in the immutability of species - How far the theory of Natural Selection may be extended - Effects of its ...
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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