Proceedings, American Philosophical Society (vol. 93, no. 6)American Philosophical Society |
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acter adaptive adaptive radiation alleles Amer animals appearance become biological biologists carpel cause changes characters chromosome combinations concept correlation Darwin differential diploid direction discussion Dobzhansky Drosophila ecologic effects environment Eocene evidence evolutionary experiment extinction fact factor families and orders favor fertile fossil frequency G. G. Simpson G. L. Jepsen genera genes geneticists genotypes genus geographical groups H. J. Muller Haldane haploid Huxley hybrid important increase individuals interbreeding isolating mechanisms known lation London Mayr modern morphological multiplication multituberculates muta mutations natural selection Naturalist occur Ohio Jour organism origin of species orthogenesis Paleocene paleontologists panmictic phylogeny physiological phytosaurs plants pollinated populations Press Princeton Proc races relation relatively reproductive isolation result rodents role seed dispersal selective value single speciation structure studies subspecies survival systematic theory of evolution theory of natural tion tive types Univ variability variations varieties Vries Wright
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Page 471 - This work was aided in part by a grant from the Dr. Wallace C. and Clara A. Abbott Memorial Fund of the University of Chicago...
Page 480 - So again it is difficult to avoid personifying the word Nature ; but I mean by nature only the aggregate action and product of many natural laws, and by laws the sequence of events as ascertained by us.
Page 480 - 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 480 - This preservation of favourable individual differences and variations, and the destruction of those which are injurious, I have called Natural Selection, or the Survival of the Fittest.
Page 480 - ... 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. No one objects to agriculturists speaking of the potent effects of man's selection; and in this case the individual differences given by nature, which man for some object selects, must of necessity first occur.
Page 480 - It has been said that I speak of natural selection as an active power or Deity; but who objects to an author speaking of the attraction of gravity as ruling the movements of the planets?
Page 482 - The statement has often been made that natural selection " originates nothing " because it does not explain the origin of variations. I must confess to scant patience with this point of view. As well say that the sculptor does not make the statue because he does not manufacture the marble or his chisel ; or that the worker in mosaic originates nothing because he does not make the bits of stone which he assembles in his design! The material corresponding to the bits of stone in the mosaic is furnished...
Page 480 - I have called Natural Selection, or the Survival of the Fittest. Variations neither useful nor injurious would not be affected by natural selection, and would be left either a fluctuating element, as perhaps we see in certain polymorphic species, or would ultimately become fixed, owing to the nature of the organism and the nature of the conditions.
Page 496 - A revision of the African silurid fishes of the subfamily Clariinae. Proc. Zool. Soc.
Page 459 - Darwin's theory of evolution through natural selection was undoubtedly the most revolutionary theory of all time. It surpassed even the astronomical revolution ushered in by Copernicus in the significance of its implications for our understanding of the nature of the universe and of our place and role in it. ... Darwin's masterly marshalling of the evidence for this [the ordering effect of natural selection] , and his keen-sighted development...