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 113
... less severe , and there will have been less modification and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
... less severe , and there will have been less modification and less extermination . Hence , we can understand how it is that the flora of Madeira , according to Oswald Heer , resembles to a certain extent the extinct tertiary flora of ...
Página 412
... less direct competition with each other and with the aborigines ; and according as the immigrants were capable of varying more or less rapidly , there would ensue in the two or more regions , independently of their physical condi- tions ...
... less direct competition with each other and with the aborigines ; and according as the immigrants were capable of varying more or less rapidly , there would ensue in the two or more regions , independently of their physical condi- tions ...
Página 423
... less service- able , because less constant . În classing varieties , I apprehend that if we had a real pedigree , a genealogical classification would be universally preferred ; and it has been attempted in some cases . For we might feel ...
... less service- able , because less constant . În classing varieties , I apprehend that if we had a real pedigree , a genealogical classification would be universally preferred ; and it has been attempted in some cases . For we might feel ...
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