The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 251
... larvæ might be ren- dered by natural selection more and more different from their parents to any conceivable extent . Differences in the larva might , also , become correlated with successive stages of its development ; so that the ...
... larvæ might be ren- dered by natural selection more and more different from their parents to any conceivable extent . Differences in the larva might , also , become correlated with successive stages of its development ; so that the ...
Página 252
... larval form is described by M. Fabre , as an active , minute insect , furnished with six legs , two long anten- næ , and four eyes . These larvæ are hatched in the nests of bees ; and when the male - bees emerge from their burrows , in ...
... larval form is described by M. Fabre , as an active , minute insect , furnished with six legs , two long anten- næ , and four eyes . These larvæ are hatched in the nests of bees ; and when the male - bees emerge from their burrows , in ...
Página 254
... larvæ state to some special line of life , and transmitted the same larval state to a whole group of descendants ; for such larval will not resemble any still more ancient form in its adult state . Thus , as it seems to me , the leading ...
... larvæ state to some special line of life , and transmitted the same larval state to a whole group of descendants ; for such larval will not resemble any still more ancient form in its adult state . Thus , as it seems to me , the leading ...
Página 255
... larval state , of all the members of the same great class . Rudimentary , Atrophied , and Aborted Organs . Organs or parts in this strange condition , bearing the plain stamp of inutility , are extremely common , or even general ...
... larval state , of all the members of the same great class . Rudimentary , Atrophied , and Aborted Organs . Organs or parts in this strange condition , bearing the plain stamp of inutility , are extremely common , or even general ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings