The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life and The Descent of Man and Selection in Relation to SexModern library, 1936 - 1000 páginas |
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Página 259
... single stem , till the group becomes large . On Extinction We have as yet only spoken incidentally of the disappearance of spe- cies and of groups of species . On the theory of natural selection , the ex- tinction of old forms and the ...
... single stem , till the group becomes large . On Extinction We have as yet only spoken incidentally of the disappearance of spe- cies and of groups of species . On the theory of natural selection , the ex- tinction of old forms and the ...
Página 283
... single or multiple centres of creation differs from an- other though allied question , -namely , whether all the individuals of the same species are descended from a single pair , or single hermaphrodite , or whether , as some authors ...
... single or multiple centres of creation differs from an- other though allied question , -namely , whether all the individuals of the same species are descended from a single pair , or single hermaphrodite , or whether , as some authors ...
Página 541
... single pair , or even from a single individual possessing some new character ; but most of our races have been formed , not intentionally from a selected pair , but unconsciously by the preservation of many indi- viduals which have ...
... single pair , or even from a single individual possessing some new character ; but most of our races have been formed , not intentionally from a selected pair , but unconsciously by the preservation of many indi- viduals which have ...
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The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1936 |
Términos y frases comunes
acquired adult allied apes appear beak beautiful become believe birds breeds cause characters civilised closely colour common confined crossed crustaceans degree descended developed distinct species domestic doubt eggs existing extinct extremely fact favourable feathers female fertility fishes formation forms Fritz Müller genera genus given gradations greater number groups habits Hence hybrids important individuals inhabitants inherited insects instance instincts intermediate islands kind larvæ latter Lepidoptera less likewise living lower animals Malay Archipelago males mammæ mammals manner Marsupials modified monkeys natural selection naturalists nearly nest observed ocelli offspring organs Origin of Species ornaments perfect period pigeons plumage pollen present probably produced progenitor quadrupeds races Red Grouse relation remarks resemble rudimentary seeds sexes sexual selection shew shewn slight South America sterility stridulating structure supposed tail tion variability variations varieties various vary whilst whole widely wings young