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 6
... appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a ...
... appear only in the offspring when nearly mature ; peculiarities in the silkworm are known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a ...
Página 174
... appear to us as if they had been simultaneously developed . The best answer , however , to the above objection is afforded by those domestic races which have been modified , chiefly through man's power of selection , for some special ...
... appear to us as if they had been simultaneously developed . The best answer , however , to the above objection is afforded by those domestic races which have been modified , chiefly through man's power of selection , for some special ...
Página 405
... appears in the parent , it tends to re - appear at a corresponding age in the offspring . Certain variations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
... appears in the parent , it tends to re - appear at a corresponding age in the offspring . Certain variations can only appear at corresponding ages ; for instance , peculiarities in the caterpillar , cocoon , or imago states of the silk ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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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