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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... naturalists in the seventeenth and eighteenth centuries , including the Englishman Ray , the Frenchman Tournefort , and the Swede Linnæus who in the early eighteenth century introduced the method of classifying plants and animals which ...
... naturalists in the seventeenth and eighteenth centuries , including the Englishman Ray , the Frenchman Tournefort , and the Swede Linnæus who in the early eighteenth century introduced the method of classifying plants and animals which ...
Página 287
... naturalists to be identical with existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specifically distinct , though the distinction is admitted to be very slight ; so ...
... naturalists to be identical with existing species ; but some excellent naturalists , as Agassiz and Pictet , maintain that all these tertiary species are specifically distinct , though the distinction is admitted to be very slight ; so ...
Página 438
... naturalists , endowed with much flexibility of mind , and who have already begun to doubt the immutability of species , may be influenced by this volume ; but I look with confidence to the future , —to young and rising naturalists , who ...
... naturalists , endowed with much flexibility of mind , and who have already begun to doubt the immutability of species , may be influenced by this volume ; but I look with confidence to the future , —to young and rising naturalists , who ...
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