The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1873 - Всего страниц: 458 |
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Стр. vi
... manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner Reversions to long - lost characters - Summary - 106-132 CHAPTER ...
... manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner Reversions to long - lost characters - Summary - 106-132 CHAPTER ...
Стр. xx
... manner by the Rev. Baden Powell , in his Essays on the Unity of Worlds , ' 1855. Nothing can be more striking than the manner in which he shows that the introduction of new species is " a regular , * From references in Bronn's ...
... manner by the Rev. Baden Powell , in his Essays on the Unity of Worlds , ' 1855. Nothing can be more striking than the manner in which he shows that the introduction of new species is " a regular , * From references in Bronn's ...
Стр. 3
... manner profitable to itself , under the com- plex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
... manner profitable to itself , under the com- plex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
Стр. 4
... manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I ...
... manner as the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I ...
Стр. 6
... manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight changes , such as size from the amount ...
... manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight changes , such as size from the amount ...
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The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
Часто встречающиеся слова и выражения
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 lamellæ larvæ 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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Стр. 1 - 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.
Стр. 162 - ... 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
Стр. 1 - ... 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...
Стр. 424 - 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.
Стр. 50 - In these several senses, which pass into each other, I use for convenience' sake the general term of Struggle for Existence.
Стр. 322 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
Стр. 146 - 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.
Стр. 310 - 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...
Стр. 57 - Now the number of. mice is largely dependent, as every one knows, on the number of cats; and Col.
Стр. 103 - 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...