Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published LettersJohn Murray, 1902 - 348 من الصفحات |
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الصفحة 22
... pollen- grains on a damp surface , I saw the tubes exserted , and in- stantly rushed off to communicate my surprising discovery to him . Now I do not suppose any other professor of botany could have helped laughing at my coming in such ...
... pollen- grains on a damp surface , I saw the tubes exserted , and in- stantly rushed off to communicate my surprising discovery to him . Now I do not suppose any other professor of botany could have helped laughing at my coming in such ...
الصفحة 45
... pollen from the short stamens , were found to yield more seeds than any other of the four possible unions , the abortion - theory was knocked on the head . After some additional experiment , it became evident that the two forms , though ...
... pollen from the short stamens , were found to yield more seeds than any other of the four possible unions , the abortion - theory was knocked on the head . After some additional experiment , it became evident that the two forms , though ...
الصفحة 48
... pollen from one plant to another of the same species . I now believe , how- ever , chiefly from the observations of Hermann Müller , that I ought to have insisted more strongly than I did on the many adaptations for self - fertilisation ...
... pollen from one plant to another of the same species . I now believe , how- ever , chiefly from the observations of Hermann Müller , that I ought to have insisted more strongly than I did on the many adaptations for self - fertilisation ...
الصفحة 300
... pollen from other plants ? Because this may be applied to show all plants do receive intermixture . " Sprengel , * indeed , understood that the hermaphrodite structure of flowers by no means necessarily leads to self- fertilisation ...
... pollen from other plants ? Because this may be applied to show all plants do receive intermixture . " Sprengel , * indeed , understood that the hermaphrodite structure of flowers by no means necessarily leads to self- fertilisation ...
الصفحة 301
... pollen from a distinct individual , the offspring so produced are superior in vigour to the offspring of self - fertilisation , i.e. of the union of the male and female elements of a single plant . When this fact was established , it ...
... pollen from a distinct individual , the offspring so produced are superior in vigour to the offspring of self - fertilisation , i.e. of the union of the male and female elements of a single plant . When this fact was established , it ...
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A. R. Wallace abstract admirable afterwards animals answer Asa Gray asked Athenæum Barmouth Beagle believe C. D. to J. D. Cambridge Captain Fitz-Roy chapter Charles Darwin Christ's College copies Coral curious DEAR delight doubt edition Erasmus Darwin essay Evolution expressed facts feel felt fertilisation flowers Fritz Müller gave geological give glad hear heard Henslow honour hope Huxley Ilkley insects interest Josiah Wedgwood Journal kind letter Linnean living London look Lyell Maer manner mind Murray Natural History natural selection naturalist never observations Orchids Origin of Species Pangenesis paper plants pleasant pleasure pollen Professor publication published Recollections remarkable remember scientific seems Shrewsbury Sir J. D. Hooker sketch Society T. H. Huxley tell thank theory thing thought tion views voyage Wallace whole wish words write written wrote to Sir
مقاطع مشهورة
الصفحة 40 - I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from longcontinued observation of the habits of animals and plants...
الصفحة 51 - The loss of these tastes, is a loss of happiness, and may possibly be injurious to the intellect, and more probably to the moral character, by enfeebling the emotional part of our nature.
الصفحة 173 - At last gleams of light have come, and I am almost convinced (quite contrary to the opinion I started with) that species are not (it is like confessing a murder) immutable.
الصفحة 185 - I never saw a more striking coincidence ; if Wallace had my MS. sketch written out in 1842, he could not have made a better short abstract ! Even his terms now stand as heads of my chapters.
الصفحة 27 - The voyage of the Beagle has been by far the most important event in my life, and has determined my whole career...
الصفحة 278 - ... that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction — the following words : " I am convinced that natural selection has been the main but not the exclusive means of modification.
الصفحة 236 - I am bewildered. I had no intention to write atheistically. But I own that I cannot see as plainly as others do, and as I should wish to do, evidence of design and beneficence on all sides of us.
الصفحة 52 - 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. Indeed, I have had no choice but to act in this manner, for with the exception of the Coral Reefs, I cannot remember a single first-formed hypothesis which had not after a time to be given up or greatly modified.
الصفحة 40 - After my return to England it appeared to me that by following the example of Lyell in Geology, and by collecting all facts which bore in any way on the variation of animals and plants under domestication and nature, some light might perhaps be thrown on the whole subject. My first note-book was opened in July 1837. 1 worked on true Baconian principles, and without any theory collected facts on a whole-sale scale...
الصفحة 239 - I asserted — and I repeat — that a man has no reason to be ashamed of having an ape for his grandfather. If there were an ancestor whom I should feel shame in recalling it would rather be a man — a man of restless and versatile intellect — who, not content with an equivocal success in his own sphere of activity, plunges into scientific questions with which he has no real acquaintance...