The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1882 - Всего страниц: 458 |
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Стр. xii
... young cuckoos ejecting their foster - brothers confirmed . 268 270 215 307 240 319 248 326 252 377 284 301 402 440 328 463 343 505 373 516 382 518 384 520 385 521 387 541 401 547 405 552 409 568 421 572 424 On the cuckoo - like habits ...
... young cuckoos ejecting their foster - brothers confirmed . 268 270 215 307 240 319 248 326 252 377 284 301 402 440 328 463 343 505 373 516 382 518 384 520 385 521 387 541 401 547 405 552 409 568 421 572 424 On the cuckoo - like habits ...
Стр. 6
... young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly ...
... young of the same litter , and in seedlings from the same seed - capsule . At long intervals of time , out of millions of individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly ...
Стр. 7
... young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see ...
... young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see ...
Стр. 41
... young naturalist commences the study of a group of organisms quite unknown to him , he is at first much perplexed in determining what differences to consider as specific , and what as varietal ; for he knows nothing of the amount and ...
... young naturalist commences the study of a group of organisms quite unknown to him , he is at first much perplexed in determining what differences to consider as specific , and what as varietal ; for he knows nothing of the amount and ...
Стр. 51
... young in the interval , and surviving till one hundred years old ; if this be so , after a period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better ...
... young in the interval , and surviving till one hundred years old ; if this be so , after a period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better ...
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 |
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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 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 tend theory tion variability variations varieties vary whilst whole wings young
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Стр. 64 - It may be said that natural selection is daily and hourly scrutinising, throughout the world, every variation, even the slightest; rejecting that which is bad, preserving and adding up all that is good; silently and insensibly working, whenever and wherever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.
Стр. 48 - In these several senses, which pass into each other, I use for convenience' sake the general term of Struggle for Existence.
Стр. 63 - Nature's productions should be far 'truer' in character than man's productions; that they should be infinitely better adapted to the most complex conditions of life, and should plainly bear the stamp of far higher workmanship?
Стр. 61 - If such do occur, can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed.
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. 48 - It is the doctrine of Malthus applied with manifold force to the whole animal and vegetable kingdoms ; for in this case there can be no artificial increase of food, and no prudential restraint from marriage.
Стр. 382 - What can be more curious than that the hand of a man, formed for grasping, that of a mole for digging, the leg of the horse, the paddle of the porpoise, and the wing of the bat, should all be constructed on the same pattern, and should include similar bones, in the same relative positions?
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. 61 - Several writers have misapprehended or objected to the term Natural Selection, Some have even imagined that natural selection induces variability, whereas it' implies only the. preservation of such variations as arise and are beneficial to the being under its conditions of * life.
Стр. xvii - 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.