The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 1권D. Appleton & Company, 1889 |
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63개의 결과 중 6 - 10개
12 페이지
... whole skeleton , than do the same bones in the wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parents . The great and inherited development of the udders ...
... whole skeleton , than do the same bones in the wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parents . The great and inherited development of the udders ...
14 페이지
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
15 페이지
... whole subject would be , to look at the inheritance of every character whatever as the rule , and non - in- heritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same ...
... whole subject would be , to look at the inheritance of every character whatever as the rule , and non - in- heritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same ...
19 페이지
... whole amount of difference between the several breeds of the dog has been produced under domesti- cation ; I believe that a small part of the difference is due to their being descended from distinct species . In the case of strongly ...
... whole amount of difference between the several breeds of the dog has been produced under domesti- cation ; I believe that a small part of the difference is due to their being descended from distinct species . In the case of strongly ...
21 페이지
... whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidae have been tamed , and that their blood , in some cases mingled together , flows in the veins of our do ...
... whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidae have been tamed , and that their blood , in some cases mingled together , flows in the veins of our do ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely Cloth colour common crossed cuckoo degree descendants developed difficulty distinct species disuse domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus gradations greater number groups habits Hence hermaphrodites hive-bee important improved inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Mivart modified natural selection naturalists nearly nest neuters occasionally offspring organisation organs origin ORIGIN OF SPECIES parent perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle sub-breeds supposed swimbladder tend tendency tion transitional tree tumbler pigeon variability variations varieties vary widely wild wings young
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227 페이지 - 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.
203 페이지 - 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.
75 페이지 - 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.
xxv 페이지 - As many more individuals of each species are born than can possibly survive ; and as, consequently, there is a frequently recurring straggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected.
xix 페이지 - 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.
144 페이지 - It is well known that several animals, belonging to the most different classes, which inhabit the caves of Carniola and of Kentucky, are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone; — the stand for the telescope is there, though the telescope with its glasses has been lost. As it is difficult to imagine that eyes, though useless, could be in any way injurious to animals living in darkness, their loss may be attributed to disuse.
55 페이지 - Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult — at least I have found it so — than constantly to bear this conclusion in mind.
341 페이지 - Cloth, $2.00. DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES. With Illustrations. 12mo. Cloth, $1.50. THE POWER OF MOVEMENT IN PLANTS. By CHARLES DARWIN, LL. D., FRS, assisted by FRANCIS DARWIN.
140 페이지 - 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.
140 페이지 - The affinities of all the beings of the same class have sometimes been represented by a great tree. I believe this simile largely speaks the truth. The green and budding twigs may represent existing species ; and those produced during each former year may represent the long succession of extinct species.