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 39
... given , for the sake of convenience , to a set of individuals closely resembling each other , and that it does not essentially differ from the term variety , which is given to less distinct and more fluctuating forms . The term variety ...
... given , for the sake of convenience , to a set of individuals closely resembling each other , and that it does not essentially differ from the term variety , which is given to less distinct and more fluctuating forms . The term variety ...
Página 384
... given in the diagram on a flat surface , is much too simple . The branches ought to have diverged in all directions ... given rise to few new languages , whilst others had altered much owing to the spreading , isolation , and state of ...
... given in the diagram on a flat surface , is much too simple . The branches ought to have diverged in all directions ... given rise to few new languages , whilst others had altered much owing to the spreading , isolation , and state of ...
Página 450
... given locality . ENTOMOSTRACA . - A division of the class Crustacea , having all the segments of the body usually ... given geological period . FELIDE . The Cat - family . FERAL . Having become wild from a state of cultivation or ...
... given locality . ENTOMOSTRACA . - A division of the class Crustacea , having all the segments of the body usually ... given geological period . FELIDE . The Cat - family . FERAL . Having become wild from a state of cultivation or ...
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