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 68
... 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 290
... given of these facts , any more than why certain trees cannot be grafted on others . Lastly , an embryo may be developed , and then perish at an early period . This latter alternative has not been sufficiently attended to ; but I ...
... given of these facts , any more than why certain trees cannot be grafted on others . Lastly , an embryo may be developed , and then perish at an early period . This latter alternative has not been sufficiently attended to ; but I ...
Página 477
... given in this volume should shock the religious feelings of any one . It is satisfactory , as showing how transient such impressions are , to remember that the greatest discovery ever made by man , namely , the law of the attraction of ...
... given in this volume should shock the religious feelings of any one . It is satisfactory , as showing how transient such impressions are , to remember that the greatest discovery ever made by man , namely , the law of the attraction of ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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