The Origin of species by means of natural selection, or, The preservation of favored races in the struggle for life v. 1-2, Volumes 1-2D. Appleton and Company, 1912 |
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Page xvi
... animals tend to vary in some degree , and , secondly , that agri- culturists improve their domesticated animals by selec- tion ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
... animals tend to vary in some degree , and , secondly , that agri- culturists improve their domesticated animals by selec- tion ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
Page 10
... animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun ...
... animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun ...
Page 11
... animals and plants , though often weak and sickly , breeding freely under confinement ; and when , on the other hand , we see individuals , though taken young from a state of nature perfectly tamed , long - lived and healthy ( of which ...
... animals and plants , though often weak and sickly , breeding freely under confinement ; and when , on the other hand , we see individuals , though taken young from a state of nature perfectly tamed , long - lived and healthy ( of which ...
Page 13
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
Page 20
... animals and plants , it is not possible to come to any definite conclusion , whether they are descended from one or several wild species . The argument mainly relied on by those who believe in the multiple origin of our domestic animals ...
... animals and plants , it is not possible to come to any definite conclusion , whether they are descended from one or several wild species . The argument mainly relied on by those who believe in the multiple origin of our domestic animals ...
Common terms and phrases
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 lamellę larvę 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
Popular passages
Page 227 - 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.
Page 275 - 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...
Page 79 - 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.
Page 251 - 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.
Page 109 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.
Page 118 - acts by the preservation and accumulation of small inherited modifications, each profitable to the preserved being.
Page 99 - 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.
Page xxiii - 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.
Page 102 - ... 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...
Page 109 - ... 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...