The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 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 8
... 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. 8 [ CHAP . I. VARIATION UNDER DOMESTICATION ...
... 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. 8 [ CHAP . I. VARIATION UNDER DOMESTICATION ...
Página 10
... males of our domestic breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A ... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by ...
... males of our domestic breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A ... male element . Having alluded to the subject of reversion , I may here refer to a statement often made by ...
Página 15
... male bird , is also remarkable from the wonderful develop- ment 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 ...
... male bird , is also remarkable from the wonderful develop- ment 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 ...
Página 16
... males and females have come to differ in a slight degree in each other . Altogether at least a score of pigeons might be chosen , which , if shown to an ornithologist , and he were told that they were wild birds , would certainly be ...
... males and females have come to differ in a slight degree in each other . Altogether at least a score of pigeons might be chosen , which , if shown to an ornithologist , and he were told that they were wild birds , would certainly be ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young