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 v
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects - Methodical ...
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects - Methodical ...
Page vi
... : secondary sexual characters variable - Species of the same genus vary in an analogous manner Reversions to long - lost characters - Summary 131-170 - CHAPTER VI . DIFFICULTIES ON THEORY . Difficulties on the. vi CONTENTS .
... : secondary sexual characters variable - Species of the same genus vary in an analogous manner Reversions to long - lost characters - Summary 131-170 - CHAPTER VI . DIFFICULTIES ON THEORY . Difficulties on the. vi CONTENTS .
Page vii
... DIFFICULTIES ON THEORY . Difficulties on the theory of descent with modification - Transitions- Absence or rarity of ... difficulty- Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The ...
... DIFFICULTIES ON THEORY . Difficulties on the theory of descent with modification - Transitions- Absence or rarity of ... difficulty- Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The ...
Page ix
... difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters -Affinities , general , complex and ...
... difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters -Affinities , general , complex and ...
Page 5
... difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately ...
... difficulties on the theory will be given : namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately ...
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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