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 1
... present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that mystery of mysteries , as it has been called by one of our greatest philosophers . On my return home , it ...
... present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that mystery of mysteries , as it has been called by one of our greatest philosophers . On my return home , it ...
Página 15
... present empirical . Moreover , on the view of the origin of genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I ...
... present empirical . Moreover , on the view of the origin of genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I ...
Página 19
... present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can hardly believe . Sir J. Sebright ex- pressly experimentised for this object , and failed ...
... present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can hardly believe . Sir J. Sebright ex- pressly experimentised for this object , and failed ...
Página 21
... - pigeon , they must have descended from at least seven or eight aboriginal stocks ; for it is im- possible to make the present domestic breeds by the crossing of any lesser number : how , for instance VARIATION UNDER DOMESTICATION 21.
... - pigeon , they must have descended from at least seven or eight aboriginal stocks ; for it is im- possible to make the present domestic breeds by the crossing of any lesser number : how , for instance VARIATION UNDER DOMESTICATION 21.
Página 30
... present day are compared with drawings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed - raisers do not pick out the best plants , but merely go over their seed - beds , and pull ...
... present day are compared with drawings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed - raisers do not pick out the best plants , but merely go over their seed - beds , and pull ...
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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