The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 9
... probably would be modified in the same manner . Such facts as the com- plex and extraordinary out - growths which invariably fol low 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 com- plex and extraordinary out - growths which invariably fol low from the insertion of a minute drop of poison by a gall - producing insect , show us what singular ...
Página 13
... 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 21
... 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 30
... probably quite correct , if applied to species closely related to each other . But to extend it so far as to suppose that species , aborigi- nally as distinct as carriers , tumblers , pouters , and fan- tails now are , should yield ...
... probably quite correct , if applied to species closely related to each other . But to extend it so far as to suppose that species , aborigi- nally as distinct as carriers , tumblers , pouters , and fan- tails now are , should yield ...
Página 34
... 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 contrivance , 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 contrivance , is only a variety of the wild Dipsacus ; and this ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young