On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página 7
... male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native country ! 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 country ! This is generally , but erroneously , attributed to vitiated instincts . Many cultivated plants ...
Página 9
... males . Colour and constitutional peculiarities go together , of which many remarkable 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 constitutional peculiarities go together , of which many remarkable 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 10
... males of our domestic breeds are often transmitted , 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 transmitted , 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 11
... 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 15
... 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 admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important 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 occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young