The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life, Том 1John Murray, 1888 - Всего страниц: 458 |
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Стр. 26
... rock - pigeon ( Columba livia ) , in- cluding under this term several geographical races or sub - species , which ... pigeons are known ; and these 26 [ CHAP . I. DOMESTIC PIGEONS .
... rock - pigeon ( Columba livia ) , in- cluding under this term several geographical races or sub - species , which ... pigeons are known ; and these 26 [ CHAP . I. DOMESTIC PIGEONS .
Стр. 27
... rock - pigeons are known ; and these have not any of the characters of the ... pigeon , which has the same habits with the domestic breeds , has not been ... rock - pigeon seems a very rash assumption . Moreover , the several above- named ...
... rock - pigeons are known ; and these have not any of the characters of the ... pigeon , which has the same habits with the domestic breeds , has not been ... rock - pigeon seems a very rash assumption . Moreover , the several above- named ...
Стр. 28
... pigeons well deserve consideration . The rock - pigeon is of a slaty- blue , with white loins ; but the Indian sub - species , C. intermedia of Strickland , has this part bluish . The tail has a terminal dark bar , with the outer ...
... pigeons well deserve consideration . The rock - pigeon is of a slaty- blue , with white loins ; but the Indian sub - species , C. intermedia of Strickland , has this part bluish . The tail has a terminal dark bar , with the outer ...
Стр. 29
... rock - pigeon ! We can under- stand these facts , on the well - known principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock - pigeon . But if we deny this , we must make one of the two ...
... rock - pigeon ! We can under- stand these facts , on the well - known principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock - pigeon . But if we deny this , we must make one of the two ...
Стр. 30
... pigeon are perfectly fertile , as I can state from my own observations , purposely made , on the most distinct ... rock - pigeon in most respects ; -the occasional re - appearance of the blue colour and various black marks in all the ...
... pigeon are perfectly fertile , as I can state from my own observations , purposely made , on the most distinct ... rock - pigeon in most respects ; -the occasional re - appearance of the blue colour and various black marks in all the ...
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
The Origin of Species by Means of Natural Selection: Or, the ..., Том 1 Charles Darwin Полный просмотр - 1898 |
Часто встречающиеся слова и выражения
acquired adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency theory tion transitional tree variability variations varieties vary widely wings young