On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 "In considering the Origin of Species, it is quite conceivable that a naturalist, reflecting on the mutual affinities of organic beings, on their embryological relations, their geographical distribution, geological succession, and other such facts, might come to the conclusion that each species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species inhabiting this world have been modified, so as to acquire that perfection of structure and coadaptation which most justly excites our admiration. Naturalists continually refer to external conditions, such as climate, food, & c, as the only possible cause of variation. In one very limited sense, as we shall hereafter see, this may be true; but it is preposterous to attribute to mere external conditions, the structure, for instance, of the woodpecker, with its feet, tail, beak, and tongue, so admirably adapted to catch insects under the bark of trees. In the case of the misseltoe, which draws its nourishment from certain trees, which has seeds that must be transported by certain birds, and which has flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other, it is equally preposterous to account for the structure of this parasite, with its relations to several distinct organic beings, by the effects of external conditions, or of habit, or of the volition of the plant itself"--Introduction. (PsycINFO Database Record (c) 2012 APA, all rights reserved) |
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ii 페이지
... laws . " WHEWELL : Bridgewater Treatise . " The only distinct meaning of the word ' natural ' is stated , fixed , or settled ; since what is natural as much requires and presupposes an intelligent agent to render it so , i.e. to effect ...
... laws . " WHEWELL : Bridgewater Treatise . " The only distinct meaning of the word ' natural ' is stated , fixed , or settled ; since what is natural as much requires and presupposes an intelligent agent to render it so , i.e. to effect ...
vi 페이지
... LAWS OF VARIATION . - — Effects of external conditions- Use and disuse , combined with natural selection ; organs of flight and of vision Acclimatisa- tion - Correlation of growth - Compensation and economy of growth - False ...
... LAWS OF VARIATION . - — Effects of external conditions- Use and disuse , combined with natural selection ; organs of flight and of vision Acclimatisa- tion - Correlation of growth - Compensation and economy of growth - False ...
vii 페이지
... law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection Page 171-206 ... Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
... law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection Page 171-206 ... Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
ix 페이지
... laws of , explained by variations not supervening at an early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin explained - Summary 411-458 - CHAPTER XIV . RECAPITULATION AND CONCLUSION ...
... laws of , explained by variations not supervening at an early age , and being inherited at a corresponding age - RUDIMENTARY ORGANS ; their origin explained - Summary 411-458 - CHAPTER XIV . RECAPITULATION AND CONCLUSION ...
5 페이지
... laws of variation and of corre- lation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a ...
... laws of variation and of corre- lation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a ...
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adapted affinities allied species America analogous ancient animals become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period greater number groups of species habits Hence hermaphrodites History hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring perfect pigeons plants pollen Portrait Post 8vo present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs Second Edition seeds sexual selection Silurian slight South America sterility structure struggle successive supposed theory Third Edition tion variability variations varieties vary Vols widely Woodcuts