Fifty Years of Darwinism: Modern Aspects of Evolution; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909H. Holt, 1909 - 274 стор. |
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acquired characters acters adapted faunas American animals appear arise Asa Gray biological birds blind fishes botanist brachycephaly breed causes cave cells changes of proportion char Characins Charles Darwin chromatin chromosomes color cusps Darwinian direction discontinuous dolichocephaly effects elements eliminated environment Eocene evidence evolution evolutionary existence experiments fact factor Francis Darwin fresh water gametophyte gemmules genus germ-cells germ-plasm germinal Gymnosperms hereditary heredity Homoplasy Hooker horns Huxley hypothesis idioplasm individual intergrades isolation kinship Lamarckian large number less Letters Lyell mammals ment modification muta mutation Natural Selection naturalist observation ontogeny organs origin of adaptations Origin of Species orthogenesis Osborn ovaries paleontology pangenesis parent phyla pigment plants present principle produced protoplasm psychic psychology question race rectigradations relation seed segregation soma somatic sooty stage structure tations teeth theory tion titanotheres transmission unit characters variations Vries Waagen Weismann yellow
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Сторінка 14 - she seems, So careless of the single life; ' So careful of the type' ? but no, From scarped cliff and quarried stone She cries ' A thousand types are gone: I care for nothing, all shall go.'
Сторінка 206 - These laws, taken in the largest sense, (are) growth, with reproduction; inheritance, which is almost implied by reproduction; variability, from the indirect and direct action of the external conditions of life, and from use and disuse; a
Сторінка 11 - gives Lamarck's theory. I will quote one sentence. Speaking of birds' beaks, he says: ' All which seem to have been gradually produced during many generations by the perpetual endeavor of the creatures to supply the want of food, and to have been delivered to their posterity with constant improvement of them for the purposes required.
Сторінка 45 - had said:—" Strictly speaking, therefore, Mr. Darwin's theory is not a theory of the Origin of Species at all, but only a theory on the causes which lead to the relative success and failure of such new forms as may be born into the world.
Сторінка 12 - Consistent uniformitarianism postulates evolution as much in the organic as in the inorganic world. The origin of a new species by other than ordinary agencies would be a vastly greater ' catastrophe' than any of those which Lyell successfully eliminated from sober geological speculation.
Сторінка 36 - Here I first saw a tropical forest in all its sublime grandeur—nothing but the reality can give any idea how wonderful, how magnificent the scene is. ... I never experienced such intense delight. I formerly admired Humboldt, I now almost adore him; he alone gives any notion of the feelings which are raised in
Сторінка 22 - I cannot conclude without expressing my detestation of the theory, because of its unflinching materialism; because it has deserted the inductive track, the only track that leads to physical truth; because it utterly repudiates final causes, and thereby indicates a demoralized understanding on the part of its advocates.
Сторінка 51 - Again, the slight differences selected, by which a race or species is at last formed, stands, as I think can be shown (even with plants, and obviously with animals), in a far more important relation to its associates than to external conditions. Therefore, according to my principles, whether right or wrong, I
Сторінка 207 - of increase so high as to lead to a struggle for life, and as a consequence Natural Selection entailing divergence of
Сторінка 22 - You have deserted—after a start in that tram-road of all solid physical truth—the true method of induction, and started us in machinery as wild, I think, as Bishop Wilkins's locomotive that was to sail with us to the moon.