On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 43
... amount of difference between the species is often exceedingly small . I have endeavoured to test this numerically by averages , and , as far as my imperfect results go , they confirm the view . I have also consulted some sagacious and ...
... amount of difference between the species is often exceedingly small . I have endeavoured to test this numerically by averages , and , as far as my imperfect results go , they confirm the view . I have also consulted some sagacious and ...
Página 92
... amount of divergent modification may have been aug- mented . This case would be represented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to a10 . In the same way the English race - horse ...
... amount of divergent modification may have been aug- mented . This case would be represented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to a10 . In the same way the English race - horse ...
Página 121
... amount of diversification ; the homologous valves in the different species being sometimes wholly unlike in shape ; and the amount of variation in the individuals of the same species is so great , that it is no exaggeration to state ...
... amount of diversification ; the homologous valves in the different species being sometimes wholly unlike in shape ; and the amount of variation in the individuals of the same species is so great , that it is no exaggeration to state ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase 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 plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young