The Origin of species by means of natural selection, or, The preservation of favored races in the struggle for life v. 1-2, 1-2권D. Appleton and Company, 1912 |
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adapted advantage analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause chapter characters climate closely allied colour common continued crossed degree developed difficulty distinct species divergence domestic animals domestic races doubt effects eggs existing extinct extremely fact favourable fertilisation fertility fishes flowers formation forms Fritz Müller genera genus geological Glacial period gradations greater number groups habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate islands kind lamellæ larvæ less living males mammals manner Mivart natural selection naturalists nearly offspring organisation organs Origin of Species parent peculiar perfect pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds ranked remarked resemble rock-pigeon seeds sexual sexual selection slight South America stamens sterility stigma structure struggle supposed swimbladder tend tendency theory tion trees variability variations varieties vary whilst whole widely
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227 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.
275 페이지 - These laws, taken in the largest sense, being Growth with Reproduction; Inheritance which is almost implied by reproduction; 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...
79 페이지 - Hence, as more individuals are produced than can possibly survive, there must in every case be a struggle for existence, either one individual with another of the same species, or with the individuals of distinct species, or with the physical conditions of life.
251 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.
109 페이지 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
118 페이지 - acts by the preservation and accumulation of small inherited modifications, each profitable to the preserved being.
99 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.
xxiii 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.
102 페이지 - ... pigeon on the same food; he does not exercise a long-backed or long-legged quadruped in any peculiar manner; he exposes sheep with long and short wool to the same climate. He does not allow the most vigorous males to struggle for the females. He does not rigidly destroy all inferior animals, but protects during each varying season, as far as lies in his power, all his productions. He often begins his selection by some halfmonstrous form ; or at least by some modification prominent enough to catch...
109 페이지 - ... those who have attended to the subject, believe that there is the severest rivalry between the males of many species to attract, by singing, the females. The rock-thrush of Guiana, birds of paradise, and some others, congregate ; and successive males display with the most...