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 xii
... birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial ...
... birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . Homological structure of the feet of certain marsupial animals . On serial ...
Página 15
... bird , is also remarkable from the wonderful develop- ment of the carunculated skin about the head ; and this is ... birds the head and tail touch : the oil - gland is quite aborted . Several other less distinct breeds might be ...
... bird , is also remarkable from the wonderful develop- ment of the carunculated skin about the head ; and this is ... birds the head and tail touch : the oil - gland is quite aborted . Several other less distinct breeds might be ...
Página 16
... birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differs remarkably . Lastly , in certain breeds , the males and females have come to differ in ...
... birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition , differs remarkably . Lastly , in certain breeds , the males and females have come to differ in ...
Página 17
... birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a red tail and red spot on the forehead , and which C notoriously breeds very true ; the mongrels were dusky and.
... birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a red tail and red spot on the forehead , and which C notoriously breeds very true ; the mongrels were dusky and.
Página 20
... birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are firmly ...
... birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed , or whose treatises I have read , are firmly ...
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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