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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... naturalist of the very highest rank , and the discoverer of the famous theory of Natural Selection . The great treatise in which that theory was promulgated , however , ' The Origin of Species ' - did not appear till 1859 , when Darwin ...
... naturalist of the very highest rank , and the discoverer of the famous theory of Natural Selection . The great treatise in which that theory was promulgated , however , ' The Origin of Species ' - did not appear till 1859 , when Darwin ...
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... naturalist , I was much struck with certain facts in the distribution of the inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw ...
... naturalist , I was much struck with certain facts in the distribution of the inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw ...
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... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without ... naturalist , reflecting on the mutual affinities of organic beings , on their embryological relations , their geographical ...
... naturalists , some of them personally unknown to me . I cannot , however , let this opportunity pass without ... naturalist , reflecting on the mutual affinities of organic beings , on their embryological relations , their geographical ...
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... Naturalists continually refer to external conditions , such as climate , food , etc. , as the only pos- sible cause of variation . In one very limited sense , as we shall hereafter see , this may be true ; but it is pre- posterous to ...
... Naturalists continually refer to external conditions , such as climate , food , etc. , as the only pos- sible cause of variation . In one very limited sense , as we shall hereafter see , this may be true ; but it is pre- posterous to ...
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... naturalists . From these considerations , I shall devote the first chapter of this Abstract to Variation under Domestica- tion . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is ...
... naturalists . From these considerations , I shall devote the first chapter of this Abstract to Variation under Domestica- tion . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is ...
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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