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actual adaptive advantage Amer American animals appearance authors basis become cause changes characters combinations completely concept conclusion continuous course Darwin definite differential direction discussion Early ecologic effects environment established evidence evolution evolutionary example existence experiment fact factor families favor further genera genes genetic genotypes geographical give given greater groups important increase individuals isolation Jour kinds known lead less limited living London major material means mechanisms merely multiplication mutations natural selection Naturalist observed occur orders organism origin orthogenesis paleontologists particularly plants populations possible present Press probably problem Proc produce question races reason recent reference regard relation relatively represented reproductive result role seed seems shows significance similar single speciation species steps structure studies successful tend theory thought tion tive types Univ usually variability variations varieties whole wide Wright
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 - 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...