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 183
... acquired a long neck and lofty stature , besides the giraffe , and , in a lesser degree , the camel , guanaco , and macrauchenia ? Or , again , why has not any member of the group acquired a long proboscis ? With respect to S. Africa ...
... acquired a long neck and lofty stature , besides the giraffe , and , in a lesser degree , the camel , guanaco , and macrauchenia ? Or , again , why has not any member of the group acquired a long proboscis ? With respect to S. Africa ...
Página 220
... acquired much feeling ! Turning now to the Australian species ; though these birds generally lay only one egg in a nest , it is not rare to find two and even three eggs in the same nest . In the Bronze cuckoo the eggs vary greatly in ...
... acquired much feeling ! Turning now to the Australian species ; though these birds generally lay only one egg in a nest , it is not rare to find two and even three eggs in the same nest . In the Bronze cuckoo the eggs vary greatly in ...
Página 236
... acquired through natural selection . I will not here enter on these several cases , but will confine myself to one special difficulty , which at first appeared to me insuperable , and actually fatal to the whole theory . I allude to the ...
... acquired through natural selection . I will not here enter on these several cases , but will confine myself to one special difficulty , which at first appeared to me insuperable , and actually fatal to the whole theory . I allude to 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