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 2
... variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
... variations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
Página 126
... variations in two or more distinct an allied species , or races . The frequent presence of fourteen or even sixteen tail - feathers the characters of an in the pouter may be considered as a variation representing the normal early ...
... variations in two or more distinct an allied species , or races . The frequent presence of fourteen or even sixteen tail - feathers the characters of an in the pouter may be considered as a variation representing the normal early ...
Página 175
... variations , in which the nature of the conditions apparently plays a quite subordinate part . Bud - variations , such as the appearance of a moss - rose on a common rose , or of a nectarine on a peach - tree offer good instances of ...
... variations , in which the nature of the conditions apparently plays a quite subordinate part . Bud - variations , such as the appearance of a moss - rose on a common rose , or of a nectarine on a peach - tree offer good instances of ...
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