The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1873 - 458ÆäÀÌÁö |
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... varieties when crossed and of their mongrel offspring not universal - Hybrids and mongrels compared independently of their fertility Summary 234-263 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . CONTENTS . vii.
... varieties when crossed and of their mongrel offspring not universal - Hybrids and mongrels compared independently of their fertility Summary 234-263 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . CONTENTS . vii.
6 ÆäÀÌÁö
... offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is ...
... offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is ...
7 ÆäÀÌÁö
... offspring somewhat unlike their parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily ...
... offspring somewhat unlike their parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily ...
10 ÆäÀÌÁö
... offspring at a corresponding age , though some- times earlier . In many cases this could not be otherwise ; thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in ...
... offspring at a corresponding age , though some- times earlier . In many cases this could not be otherwise ; thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in ...
11 ÆäÀÌÁö
... offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists ...
... offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists ...
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adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continuous crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young
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1 ÆäÀÌÁö - These facts, as will be seen in the latter chapters of this volume, seemed to throw some light on the origin of species — that mystery of mysteries, as it has been called by one of our greatest philosophers.
162 ÆäÀÌÁö - ... if it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory, for such could not have been produced through natural selection
1 ÆäÀÌÁö - ... of our greatest philosophers. 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...
424 ÆäÀÌÁö - Analogy would lead me one step further, namely, to the belief that all animals and plants have descended from some one prototype. But analogy may be a deceitful guide.
50 ÆäÀÌÁö - In these several senses, which pass into each other, I use for convenience' sake the general term of Struggle for Existence.
322 ÆäÀÌÁö - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
146 ÆäÀÌÁö - 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.
310 ÆäÀÌÁö - I strongly insisted, in 1839 and 1845, on this " law of the succession of types,"—on " this wonderful relationship in the same continent between the dead and the living." Professor Owen has subsequently extended the same generalisation to the mammals of the Old World. We see the same law in this author's restorations of the extinct and gigantic birds of New Zealand. We see it also in the birds of the caves of Brazil. Mr. Woodward has shown that the same law holds good with sea-shells, but, from...
57 ÆäÀÌÁö - Now the number of. mice is largely dependent, as every one knows, on the number of cats; and Col.
103 ÆäÀÌÁö - It is a truly wonderful fact—the wonder of which we are apt to overlook from familiarity—that all animals and all plants throughout all time and space should be related to each other in groups subordinate to groups, in the manner which we everywhere behold...