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 1 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION . — Longevity - Modifications not necessarily simultaneous - Modi- fications apparently of no direct service - Progressive ...
... theory of Natural Selection ..... 158 1 CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL SELECTION . — 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 ...
496 페이지
... theory would explain , in so satisfactory a manner as does the theory of natural selection , the several large classes of facts above specified . It has recently been objected that this is an unsafe method of arguing ; but it is a ...
... theory would explain , in so satisfactory a manner as does the theory of natural selection , the several large classes of facts above specified . It has recently been objected that this is an unsafe method of arguing ; but it is a ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally 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