The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 156
... characters ; and these characters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less widely- different ...
... characters ; and these characters may be attributed to inheritance from a common progenitor , for it can rarely have happened that natural selection will have modified several distinct species , fitted to more or less widely- different ...
Página 160
... characters another and distinct species , this other species being , according to our view , only a well - marked and perma- nent variety . But characters exclusively due to analogous vari- ation would probably be of an unimportant ...
... characters another and distinct species , this other species being , according to our view , only a well - marked and perma- nent variety . But characters exclusively due to analogous vari- ation would probably be of an unimportant ...
Página 420
... characters are the most important of all ; and this doctrine has very generally been admitted as true . Nevertheless , their importance has some- times been exaggerated , owing to the adaptive characters of larvæ not having been ...
... characters are the most important of all ; and this doctrine has very generally been admitted as true . Nevertheless , their importance has some- times been exaggerated , owing to the adaptive characters of larvæ not having been ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear 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 eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological 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 male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young