On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 3
... given birth to a woodpecker , and some plant to the mistletoe , and that these had been produced perfect as we now see them ; but this assumption seems to me to be no explanation , for it leaves the case of the coadaptations of organic ...
... given birth to a woodpecker , and some plant to the mistletoe , and that these had been produced perfect as we now see them ; but this assumption seems to me to be no explanation , for it leaves the case of the coadaptations of organic ...
Página 9
... given of ' sporting plants ' ; by this term gardeners mean a single bud or offset , which suddenly assumes a new and sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc ...
... given of ' sporting plants ' ; by this term gardeners mean a single bud or offset , which suddenly assumes a new and sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc ...
Página 11
... given in Isidore Geoffroy St. Hilaire's great work on this subject . Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are ...
... given in Isidore Geoffroy St. Hilaire's great work on this subject . Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are ...
Página 26
... given in a bill of fare in the previous dynasty . In the time of the Romans , as we hear from Pliny , immense prices were given for pigeons ; nay , they are come to this pass , that they can reckon up their pedigree and race . Pigeons ...
... given in a bill of fare in the previous dynasty . In the time of the Romans , as we hear from Pliny , immense prices were given for pigeons ; nay , they are come to this pass , that they can reckon up their pedigree and race . Pigeons ...
Página 27
... given . The explanation , I think , is simple : from long- continued study they are strongly impressed with the differences between the several races ; and though they well know that each race varies slightly , for they win their prizes ...
... given . The explanation , I think , is simple : from long- continued study they are strongly impressed with the differences between the several races ; and though they well know that each race varies slightly , for they win their prizes ...
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Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely