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 184
... quadrupeds , for instance S. America , though it is so luxuriant ; whilst S. Africa abounds with them to an unparalleled degree . Why this should be so , we do not know ; nor why the later tertiary periods should have been so much more ...
... quadrupeds , for instance S. America , though it is so luxuriant ; whilst S. Africa abounds with them to an unparalleled degree . Why this should be so , we do not know ; nor why the later tertiary periods should have been so much more ...
Página 311
... quadrupeds are now divided into the even - toed or odd - toed divisions ; but the Macrauchenia of South America connects to a certain extent these two grand divisions . No one will deny that the Hipparion is intermediate between the ...
... quadrupeds are now divided into the even - toed or odd - toed divisions ; but the Macrauchenia of South America connects to a certain extent these two grand divisions . No one will deny that the Hipparion is intermediate between the ...
Página 452
... Quadrupeds in some of their characters and habits . Its members have the nostrils curved or twisted , and a claw instead of a nail upon the first finger of the hind hands . Lepidoptera . — An order of Insects , characterised by the ...
... Quadrupeds in some of their characters and habits . Its members have the nostrils curved or twisted , and a claw instead of a nail upon the first finger of the hind hands . Lepidoptera . — An order of Insects , characterised by the ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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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