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 153
... Fritz Müller , after maturity . In all such cases , —and many could be given , -if the age for reproduction were retarded , the character of the species , at least in its adult state , would be modified ; nor is it improbable that the ...
... Fritz Müller , after maturity . In all such cases , —and many could be given , -if the age for reproduction were retarded , the character of the species , at least in its adult state , would be modified ; nor is it improbable that the ...
Página 156
... Fritz Müller , in order to test the conclusions arrived at in this volume , has followed out with much care a nearly similar line of argument . Several families of crustaceans include a few species , possessing an air- breathing ...
... Fritz Müller , in order to test the conclusions arrived at in this volume , has followed out with much care a nearly similar line of argument . Several families of crustaceans include a few species , possessing an air- breathing ...
Página 408
... Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water , instead of in the sea , would be greatly simplified by its not passing through any larval stage ; for it is ...
... Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water , instead of in the sea , would be greatly simplified by its not passing through any larval stage ; for it is ...
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