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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vi 페이지
... important of all relations CHAPTER IV . NATURAL SELECTION . — Page 60-79 Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual ...
... important of all relations CHAPTER IV . NATURAL SELECTION . — Page 60-79 Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual ...
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... importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
... importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
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... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is ...
... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is ...
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... . Many treatises in dif- ferent languages have been published on pigeons , and some of them are very important , as being of con- siderable antiquity . I have associated with several eminent fanciers. 20 CHAP . I. DOMESTIC PIGEONS .
... . Many treatises in dif- ferent languages have been published on pigeons , and some of them are very important , as being of con- siderable antiquity . I have associated with several eminent fanciers. 20 CHAP . I. DOMESTIC PIGEONS .
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... importance of which should never be overlooked , will ensure some dif- ferences ; but , as a general rule , I cannot ... important . But it is very far from true that the principle is a modern discovery . I could give several references ...
... importance of which should never be overlooked , will ensure some dif- ferences ; but , as a general rule , I cannot ... important . But it is very far from true that the principle is a modern discovery . I could give several references ...
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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