On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1870 - 440 стор. |
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Сторінка v
... of the forms in certain groups , and by the anal- ogy of domestic productions . With respect to the means of modification , he attributed something to the action of external conditions , something to the crossing of already existing.
... of the forms in certain groups , and by the anal- ogy of domestic productions . With respect to the means of modification , he attributed something to the action of external conditions , something to the crossing of already existing.
Сторінка ix
... action incessante sur les êtres vivants détermine , à toutes les époques de l'existence du monde , la forme , le volume et la durée de chacun d'eux , en raison de sa destinée dans l'ordre de choses dont il fait partie . C'est cette ...
... action incessante sur les êtres vivants détermine , à toutes les époques de l'existence du monde , la forme , le volume et la durée de chacun d'eux , en raison de sa destinée dans l'ordre de choses dont il fait partie . C'est cette ...
Сторінка 6
... action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction ...
... action - Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction ...
Сторінка 15
... action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How ...
... action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How ...
Сторінка 17
... action of the conditions been di- rect , if any of the young had varied , all would probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture ...
... action of the conditions been di- rect , if any of the young had varied , all would probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture ...
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On the Origin of Species by Means of Natural Selection: Or The ..., Том 2 Charles Darwin Повний перегляд - 1888 |
Загальні терміни та фрази
accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion variability variation vary whole widely
Популярні уривки
Сторінка 423 - It is interesting to contemplate a tangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other and dependent upon each other in so complex a manner, have all been produced by laws acting around us.
Сторінка 422 - 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.
Сторінка 423 - Variability from the indirect and direct action of the conditions of life, and from use and disuse; a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of higher animals, directly follows.
Сторінка 9 - 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 ; these I enlarged in 1844 into a sketch of the conclusions which then seemed to me probable : from that period to the present day I have steadily pursued the same object. I hope that I may...
Сторінка 423 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Сторінка 61 - I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection, in order to mark its relation to man's power of selection.
Сторінка 72 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
Сторінка 169 - 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.
Сторінка 420 - Our classifications will come to be, as far as they can be so made, genealogies ; and will then truly give what may be called the plan of creation.
Сторінка 11 - ... species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species inhabiting this world have been modified, so as to acquire that perfection of structure and coadaptation which most justly excites our admiration.