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 401
... larva or maggot of a fly , namely the Cecidomyia , producing asexually other larvæ , and these others , which finally are developed into mature males and females , propagating their kind in the ordinary manner by eggs . It may be worth ...
... larva or maggot of a fly , namely the Cecidomyia , producing asexually other larvæ , and these others , which finally are developed into mature males and females , propagating their kind in the ordinary manner by eggs . It may be worth ...
Página 403
... larvæ of other insects within the same order , according to their habits of life . Owing to such adaptations , the similarity of the larvæ of allied animals is sometimes greatly obscured ; especially when there is a division of labour ...
... larvæ of other insects within the same order , according to their habits of life . Owing to such adaptations , the similarity of the larvæ of allied animals is sometimes greatly obscured ; especially when there is a division of labour ...
Página 408
... larval and mature stages , under such new and greatly changed habits of life , would commonly be found unoccupied or ... larva already different from its parent to change still further , then , on the principle of inheritance at ...
... larval and mature stages , under such new and greatly changed habits of life , would commonly be found unoccupied or ... larva already different from its parent to change still further , then , on the principle of inheritance at ...
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