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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 dioecious discovery discussion doctrine Drosera Effects of Cross electric fishes electric organs exhaust experiments explanation expression Fertilization of Orchids flower-peduncles Flowers on Plants Forms of Flowers Francis Darwin furnished gemmules hypothesis Ibid illustrated important induction inference inheritance Insectivorous Plants insects interesting investigation labellum Letters logical history logical processes long-styled Malthus ment mind modified Movement in Plants muscles natural selection nectar negative evidence observation ocelli orchids Origin of Species Pangenesis pistils 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
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 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.