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 126
... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original species ( I ) differed largely from ( A ) , standing nearly at the extreme end of the original genus , the six ...
... genus or a distinct genus . The six descendants from ( I ) will form two sub - genera or genera . But as the original species ( I ) differed largely from ( A ) , standing nearly at the extreme end of the original genus , the six ...
Página 283
... genus Verbascum , can be united with unusual facility , and produce numerous hybrid offspring , yet these hybrids are remarkably sterile . On the other hand , there are species which can be crossed very rarely , or with extreme dif ...
... genus Verbascum , can be united with unusual facility , and produce numerous hybrid offspring , yet these hybrids are remarkably sterile . On the other hand , there are species which can be crossed very rarely , or with extreme dif ...
Página 422
... genus with the parent A ; or those from I , with the parent I. But the existing genus F14 may be supposed to have been but slightly modified ; and it will then rank with the parent - genus F ; just as some few still living organisms ...
... genus with the parent A ; or those from I , with the parent I. But the existing genus F14 may be supposed to have been but slightly modified ; and it will then rank with the parent - genus F ; just as some few still living organisms ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
Otras 13 secciones no mostradas
Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or, The ..., Volumen2 Charles Darwin Vista de fragmentos - 1972 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
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