On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for Life |
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Page 6
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close interbreeding , removed by domestication- Laws governing the sterility of hybrids - Sterility not a special endowment , but ...
... sterility of first crosses and of hybrids - Sterility various in degree , not universal , affected by close interbreeding , removed by domestication- Laws governing the sterility of hybrids - Sterility not a special endowment , but ...
Page 16
... Sterility has been said to be the bane of horticulture but on this view we owe variability to the same cause which produces sterility ; and variability is the source of all the choicest productions of the garden . I may add , that as ...
... Sterility has been said to be the bane of horticulture but on this view we owe variability to the same cause which produces sterility ; and variability is the source of all the choicest productions of the garden . I may add , that as ...
Page 30
... sterility : from the history of the dog I think there is some probability in this hypothesis if applied to species closely related to- gether , though it is unsupported by a single experiment . But to extend the hypothesis so far as to ...
... sterility : from the history of the dog I think there is some probability in this hypothesis if applied to species closely related to- gether , though it is unsupported by a single experiment . But to extend the hypothesis so far as to ...
Page 45
... sterility of hybrids ; but the cases of plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change I am convinced that the accumulative action of Selection ...
... sterility of hybrids ; but the cases of plants not propagated by seed are of little importance to us , for their endurance is only temporary . Over all these causes of Change I am convinced that the accumulative action of Selection ...
Page 216
... of one general law , leading to the advancement of all or- ganic beings , namely , multiply , vary , let the strongest live and the weakest die . CHAPTER VIII . HYBRIDISM . Distinction between the sterility of 216 [ CHAP . VIL INSTINCT .
... of one general law , leading to the advancement of all or- ganic beings , namely , multiply , vary , let the strongest live and the weakest die . CHAPTER VIII . HYBRIDISM . Distinction between the sterility of 216 [ CHAP . VIL INSTINCT .
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Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic 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 laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion variability variation vary whole widely
Popular passages
Page 423 - It is interesting to contemplate a tangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other and dependent upon each other in so complex a manner, have all been produced by laws acting around us.
Page 422 - In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
Page 423 - Variability from the indirect and direct action of the conditions of life, and from use and disuse; a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of higher animals, directly follows.
Page 9 - On my return home, it occurred to me, in 1837, that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it. After five years' work I allowed myself to speculate on the subject, and drew up some short notes ; these I enlarged in 1844 into a sketch of the conclusions which then seemed to me probable : from that period to the present day I have steadily pursued the same object. I hope that I may...
Page 423 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Page 61 - I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection, in order to mark its relation to man's power of selection.
Page 72 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Page 169 - If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.
Page 420 - Our classifications will come to be, as far as they can be so made, genealogies ; and will then truly give what may be called the plan of creation.
Page 11 - ... 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.