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 162
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes ; I have myself seen a dun Devon ...
... seen in duns , and I have seen a trace in a bay horse . My son made a careful examination and sketch for me of a dun Belgian cart - horse with a double stripe on each shoulder and with leg - stripes ; I have myself seen a dun Devon ...
Página 176
... seen climbing branches , almost like a creeper ; it sometimes , like a shrike , kills small birds by blows on the head ; and I have many times seen and heard it hammering the seeds of the yew on a branch , and thus break- ing them like ...
... seen climbing branches , almost like a creeper ; it sometimes , like a shrike , kills small birds by blows on the head ; and I have many times seen and heard it hammering the seeds of the yew on a branch , and thus break- ing them like ...
Página 201
... seen that species at any one period are not indefinitely variable , and are not linked together by a multitude of intermediate gradations , partly because the process of natural selection is always very slow , and at any one time acts ...
... seen that species at any one period are not indefinitely variable , and are not linked together by a multitude of intermediate gradations , partly because the process of natural selection is always very slow , and at any one time acts ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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The Origin of Species by Means of Natural Selection: Or, The ..., Volumen2 Charles Darwin Vista de fragmentos - 1972 |
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