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 5
... laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several treatises on some of our old ...
... laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several treatises on some of our old ...
Página 171
... laws of growth and variation . Hence , in fact , the law of the Conditions of Existence is the higher law ; as it includes , through the inheritance of former variations and adaptations , that of Unity of Type . Chapter Seven Longevity ...
... laws of growth and variation . Hence , in fact , the law of the Conditions of Existence is the higher law ; as it includes , through the inheritance of former variations and adaptations , that of Unity of Type . Chapter Seven Longevity ...
Página 249
... laws governing the Laws governing the sterility of first crosses and of hybrids . Our chief object will be to see sterility of first whether or not these laws indicate that species have been specially crosses and of hybrids endowed with ...
... laws governing the Laws governing the sterility of first crosses and of hybrids . Our chief object will be to see sterility of first whether or not these laws indicate that species have been specially crosses and of hybrids endowed with ...
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