The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página 10
... male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun- try ! This is generally , but erroneously , attributed to vitiated instincts . Many cultivated plants ...
... male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun- try ! This is generally , but erroneously , attributed to vitiated instincts . Many cultivated plants ...
Página 13
... males . Colour and con- stitutional peculiarities go together , of which many re- markable cases could be given amongst animals and plants . From facts collected by Heusinger , it appears that white sheep and pigs are injured by certain ...
... males . Colour and con- stitutional peculiarities go together , of which many re- markable cases could be given amongst animals and plants . From facts collected by Heusinger , it appears that white sheep and pigs are injured by certain ...
Página 15
... males of our domestic breeds are often trans- mitted , either exclusively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity ...
... males of our domestic breeds are often trans- mitted , either exclusively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at whatever period of life a peculiarity ...
Página 16
... male element ; in nearly the same manner as the increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to ...
... male element ; in nearly the same manner as the increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to ...
Página 24
... male bird , is also remarkable from the wonderful development of the carunculated skin about the head ; and this is accompanied by greatly elongated eyelids , very large external orifices to the nostrils , and a wide gape of mouth . The ...
... male bird , is also remarkable from the wonderful development of the carunculated skin about the head ; and this is accompanied by greatly elongated eyelids , very large external orifices to the nostrils , and a wide gape of mouth . The ...
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Términos y frases comunes
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 descendants 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 increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young