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 |
Результаты поиска по книге
Результаты 6 – 10 из 56
Стр. 36
... resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter see ...
... resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter see ...
Стр. 39
... resemble species so completely in character , that they have been thus ranked by other highly - competent judges . But to discuss whether they ought to be called species or varieties , before any definition of these terms has been ...
... resemble species so completely in character , that they have been thus ranked by other highly - competent judges . But to discuss whether they ought to be called species or varieties , before any definition of these terms has been ...
Стр. 45
... resemble Varieties in being very closely , but unequally , related to each other , and in having restricted ranges . There are other relations between the species of large genera and their recorded varieties which deserve notice . We ...
... resemble Varieties in being very closely , but unequally , related to each other , and in having restricted ranges . There are other relations between the species of large genera and their recorded varieties which deserve notice . We ...
Стр. 46
... resemble varieties , more than do the species of the smaller genera . Or the case may be put in another way , and it may be said , that in the larger genera , in which a number of varie- ties or incipient species greater than the ...
... resemble varieties , more than do the species of the smaller genera . Or the case may be put in another way , and it may be said , that in the larger genera , in which a number of varie- ties or incipient species greater than the ...
Стр. 47
... also tend to break up into smaller genera . And thus , the forms of life throughout the universe become divided into groups subordinate to groups . CHAPTER III . STRUGGLE FOR EXISTENCE . - - - CHAP . II . 47 resemble Varieties .
... also tend to break up into smaller genera . And thus , the forms of life throughout the universe become divided into groups subordinate to groups . CHAPTER III . STRUGGLE FOR EXISTENCE . - - - CHAP . II . 47 resemble Varieties .
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 1 Charles Darwin Полный просмотр - 1889 |
The Origin of Species by Means of Natural Selection: Or, the ..., Том 1 Charles Darwin Полный просмотр - 1898 |
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
Популярные отрывки
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...