On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página 6
... probably would be modified in the same manner . Such facts as the complex and extraordinary out - growths which invariably follow from the insertion of a minute drop of poison by a gall - producing insect , show us what singular ...
... probably would be modified in the same manner . Such facts as the complex and extraordinary out - growths which invariably follow from the insertion of a minute drop of poison by a gall - producing insect , show us what singular ...
Página 8
... probably another instance of the effects of use . Not one of our domestic animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to the disuse of the muscles of ...
... probably another instance of the effects of use . Not one of our domestic animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to the disuse of the muscles of ...
Página 9
... probably entail changes in the mature animal . In monstrosities , the correlations between quite distinct parts are very curious ; and many instances are given in Isidore Geoffroy St. Hilaire's great work on this subject . Breeders ...
... probably entail changes in the mature animal . In monstrosities , the correlations between quite distinct parts are very curious ; and many instances are given in Isidore Geoffroy St. Hilaire's great work on this subject . Breeders ...
Página 14
... probably for ever remain vague . But I may here state , that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
... probably for ever remain vague . But I may here state , that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
Página 22
... probably arisen suddenly , or by one step ; many botanists , for instance , believe that the fuller's teasel , with its hooks , which cannot be rivalled by any mechanical con- trivance , is only a variety of the wild Dipsacus ; and this ...
... probably arisen suddenly , or by one step ; many botanists , for instance , believe that the fuller's teasel , with its hooks , which cannot be rivalled by any mechanical con- trivance , is only a variety of the wild Dipsacus ; and this ...
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Términos y frases comunes
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young