The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Том 1D. Appleton, 1896 |
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... VARIATION UNDER DOMESTICATION . - - Character of Causes of Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance · Domestic Varieties - Difficulty of distinguishing between Varieties and ...
... VARIATION UNDER DOMESTICATION . - - Character of Causes of Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance · Domestic Varieties - Difficulty of distinguishing between Varieties and ...
Стр. 4
... variation under domestication , afforded the best and safest clue . I may venture to express my conviction of the high ... variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately ...
... variation under domestication , afforded the best and safest clue . I may venture to express my conviction of the high ... variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately ...
Стр. 7
Charles Darwin. CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties — Difficulty of distinguishing ...
Charles Darwin. CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties — Difficulty of distinguishing ...
Стр. 8
... variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations ... variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
... variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations ... variations arise under conditions which appear to be nearly uniform . The effects on the offspring are either ...
Стр. 9
... variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uniformly during a long series of generations on many individuals , all probably would be modified in the same ...
... variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uniformly during a long series of generations on many individuals , all probably would be modified in the same ...
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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acquired adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young
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Стр. 103 - 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. 229 - 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. 84 - The action of climate seems at first sight to be quite independent of the struggle for existence; but in so far as climate chiefly acts in reducing food, it brings on the most severe struggle between the individuals, whether of the same or of distinct species, which subsist on the same kind of food.
Стр. 203 - Our ignorance of the laws of variation is profound. Not in one case out of a hundred can we pretend to assign any reason why this or that part differs, more or less, from the same part in the parents.
Стр. 321 - Under changed conditions of life, it is at least possible that slight modifications of instinct might be profitable to a species; and if it can be shown that instincts do vary ever so little, then I can see no difficulty in natural selection preserving and continually accumulating variations of instinct ' to any extent that was profitable. It is thus, as I believe, that all the most complex and wonderful instincts have originated.
Стр. xx - The Archetypal idea was manifested in the flesh, under divers modifications, upon this planet, long prior to the existence of those animal species that actually exemplify it.
Стр. 35 - It would seem as if they had chalked out upon a wall a form perfect in itself, and then had given it existence." In Saxony the importance of the principle of selection in regard to merino sheep is so fully recognised, that men follow it as a trade: the sheep are placed on a table and are studied, like a picture by a connoisseur; this is done three times at intervals of months, and the sheep are each time marked and classed, so that the very best may ultimately be selected for breeding.
Стр. 110 - Let us take the case of a wolf, which preys on various animals, securing some by craft, some by strength, and some by fleetness; and let us suppose that the fleetest prey, a deer for instance, had from any change in the country increased in numbers, or that other prey had decreased in numbers, during that season of the year when the wolf was hardest pressed for food. Under such circumstances the swiftest and slimmest wolves would have the best chance of surviving...
Стр. 88 - ... plantations, which were not to be seen on the heath ; and the heath was frequented by two or three distinct insectivorous birds. Here we see how potent has been the effect of the introduction of a single tree...
Стр. 162 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was small, budding twigs; and this connection of the former and present buds by ramifying branches may well represent the classification of all extinct and living species in groups subordinate to groups.