The Method of Darwin: A Study in Scientific MethodA. C. McClurg, 1896 - 232 páginas |
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Página 13
... Sex , 1871 . Variation of Animals and Plants under Domestication , Second Edition , 1875 . Expression of the Emotions in Man and the Lower Ani- mals , 1872 . A Monograph of the Cirripedia , Vol . I. , 1851 ; Vol . II . , 1854 . The ...
... Sex , 1871 . Variation of Animals and Plants under Domestication , Second Edition , 1875 . Expression of the Emotions in Man and the Lower Ani- mals , 1872 . A Monograph of the Cirripedia , Vol . I. , 1851 ; Vol . II . , 1854 . The ...
Página 109
... sexes , for the sexes do not differ much in constitution , before the power of reproduction is gained " ; and went on to point out that characters appearing late in one sex would tend to be restricted to that sex . " I was led to infer ...
... sexes , for the sexes do not differ much in constitution , before the power of reproduction is gained " ; and went on to point out that characters appearing late in one sex would tend to be restricted to that sex . " I was led to infer ...
Página 110
... sexes . " 1 The principle that characters appearing at an early age are inherited by both sexes , and char- acters appearing late in one sex are restricted to that sex , is an induction from certain strik- ing differences between the ...
... sexes . " 1 The principle that characters appearing at an early age are inherited by both sexes , and char- acters appearing late in one sex are restricted to that sex , is an induction from certain strik- ing differences between the ...
Página 153
... sexes appear early in life , and that char- acters restricted to one sex appear late . He said , " I was led to infer that a relation of this . kind exists , from the fact that whenever and in whatever manner the adult male has come to ...
... sexes appear early in life , and that char- acters restricted to one sex appear late . He said , " I was led to infer that a relation of this . kind exists , from the fact that whenever and in whatever manner the adult male has come to ...
Página 154
... sexes have horns . He found that in seven species with horns only on the males the horns appear late , at nine months , or even later . In the reindeer , which alone has horns on both sexes , the horns appear in both sexes at the age of ...
... sexes have horns . He found that in seven species with horns only on the males the horns appear late , at nine months , or even later . In the reindeer , which alone has horns on both sexes , the horns appear in both sexes at the age of ...
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Términos y frases comunes
A. C. MCCLURG adaptations analogy Animals and Plants belief biological cause character circumnutation Cirripedia classification climbing plants colored conclusion consequences Coral Reefs cowslip cross-fertilization Darwin Darwin's theories deductive dence developed Different Forms difficulty discovery discussion doctrine Drosera Effects of Cross electric fishes electric organs example exhaust experiments explanation expression Fertilization of Orchids flower-peduncles Flowers on Plants Forms of Flowers Francis Darwin furnished gemmules hermaphrodite hypothesis Ibid illustrated important induction inference inheritance Insectivorous Plants insects interesting investigation islands labellum Letters logical history logical processes long-styled Malthus ment mind modified Movement in Plants muscles natural selection nectar observation ocelli orchids Origin of Species Pangenesis pistils point of view pollen Power of Movement principle of natural probably problem proboscides proved radicles reasoning relation remarkable scientific method seedlings seeds self-fertilized sensitiveness sexes sion stamens stigma structure theories of descent things tigation tion true truth tufaceous verified
Pasajes populares
Página 37 - I have steadily endeavoured to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as facts are shown to be opposed to it.
Página 47 - I think that I am superior to the common run of men in noticing things which easily escape attention, and in observing them carefully.
Página 89 - This wonderful relationship in the same continent between the dead and the living, will, I do not doubt, hereafter throw more light on the appearance of organic beings on our earth and their disappearance from it than any other class of facts.
Página 216 - I worked on true Baconian principles, and without any theory collected facts on a wholesale scale...
Página 157 - 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.
Página 217 - I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to nie. "In October 1838, that is, fifteen months after I had begun my systematic enquiry, I happened to read for amusement 'Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits...
Página 124 - Looking back, I think it was more difficult to see what the problems were than to solve them, so far as I have succeeded in doing, and this seems to me rather curious.
Página 28 - Everything about which I thought or read was made to bear directly on what I had seen or was likely to see ; and this habit of mind was continued during the five years of the voyage. I feel sure that it was this training which has enabled me to do whatever I have done in science.
Página 15 - Glory is like a circle in the water, Which never ceaseth to enlarge itself, Till, by broad spreading, it disperse to nought.