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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198 페이지
... laws of growth and variation . Hence , in fact , the law of the Conditions of Existence is the higher law ; as it includes , through the inheritance of former variations and adaptations , that of Unity of Type . CHAPTER VII ...
... laws of growth and variation . Hence , in fact , the law of the Conditions of Existence is the higher law ; as it includes , through the inheritance of former variations and adaptations , that of Unity of Type . CHAPTER VII ...
467 페이지
... law of nature ; and we may hope hereafter to see the law proved true . It can , how- ever , be proved true only in those cases in which the ancient state of the progenitor of the group has not been wholly obliterated , either by ...
... law of nature ; and we may hope hereafter to see the law proved true . It can , how- ever , be proved true only in those cases in which the ancient state of the progenitor of the group has not been wholly obliterated , either by ...
505 페이지
... laws , taken in the largest sense , being Growth with repro- duction , Inheritance which is almost implied by ... law of gravity , from so simple a beginning endless forms most beautiful and most wonderful have been , and are being ...
... laws , taken in the largest sense , being Growth with repro- duction , Inheritance which is almost implied by ... law of gravity , from so simple a beginning endless forms most beautiful and most wonderful have been , and are being ...
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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