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 67
... look at individual differences , though of small in- terest to the systematist , as of the highest importance for us , as being the first steps towards such slight varieties as are barely thought worth recording in works on natural ...
... look at individual differences , though of small in- terest to the systematist , as of the highest importance for us , as being the first steps towards such slight varieties as are barely thought worth recording in works on natural ...
Página 173
... Look at the Mustela vison of North America , which has webbed feet , and which resembles an otter in its fur , short legs , and form of tail . During the summer this animal dives for and preys on fish , but during the long winter it ...
... Look at the Mustela vison of North America , which has webbed feet , and which resembles an otter in its fur , short legs , and form of tail . During the summer this animal dives for and preys on fish , but during the long winter it ...
Página 367
... look to the waters , and we do not find the beaver or musk- rat , but the coypu and capybara , rodents of the S. American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
... look to the waters , and we do not find the beaver or musk- rat , but the coypu and capybara , rodents of the S. American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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 - 1963 |
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