On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life"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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Page 41
... hence this comes to be of the highest importance to success . On this principle Marshall has remarked , with respect to the sheep of parts of Yorkshire , that " as they generally belong to poor people , and are mostly in small lots ...
... hence this comes to be of the highest importance to success . On this principle Marshall has remarked , with respect to the sheep of parts of Yorkshire , that " as they generally belong to poor people , and are mostly in small lots ...
Page 47
... Hence , in determining whether a form should be ranked as a species or a variety , the opinion of natural- ists having sound judgment and wide experience seems the only guide to follow . We must , however , in many cases , decide by a ...
... Hence , in determining whether a form should be ranked as a species or a variety , the opinion of natural- ists having sound judgment and wide experience seems the only guide to follow . We must , however , in many cases , decide by a ...
Page 51
... Hence I look at individual differences , though of small interest to the systematist , as of high importance for us , as being the first step towards such slight varieties as are barely thought worth recording in works on natural ...
... Hence I look at individual differences , though of small interest to the systematist , as of high importance for us , as being the first step towards such slight varieties as are barely thought worth recording in works on natural ...
Page 52
... Hence I believe a well - marked variety may be called an incipient species ; but whether this belief be justifiable must be judged of by the general weight of the several facts and views given throughout this work . It need not be ...
... Hence I believe a well - marked variety may be called an incipient species ; but whether this belief be justifiable must be judged of by the general weight of the several facts and views given throughout this work . It need not be ...
Page 53
... - marked to have been recorded in botanical works . Hence it is the most flourishing , or , as they may be called , the dominant species , - those which range widely over the world , are the. CHAP . II . 53 DOMINANT SPECIES VARY MOST .
... - marked to have been recorded in botanical works . Hence it is the most flourishing , or , as they may be called , the dominant species , - those which range widely over the world , are the. CHAP . II . 53 DOMINANT SPECIES VARY MOST .
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Common terms and phrases
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