A DEFINITION OF EVOLUTION 



Figure 1. Charles 

 Robert Darwin. 

 ( From Fuller and 

 Tippo, "College Bot- 

 any," Revised Ed., 

 Henry Holt & Co., 

 Inc., New York, N.Y., 

 1954. ) 



published in November, 1859. With regard to the great success of this 

 work, Darwin wrote that "The success of the 'Origin' may, I think, be 

 attributed in k^rge part to my having k:)ng before written two condensed 

 sketches, and to my having finally abstracted a much larger manuscript, 

 which was itself an abstract. By this means I was enabled to select the 

 more striking facts and conclusions. I had, also, during many years fol- 

 lowed a golden rule, namely, that whenever a published fact, a new obser- 

 vation or thought came across me, which was ojiposcnl to my general 

 results, to make a memorandum of it without fail and at once; for I had 

 found by experience that such facts and thoughts were far more apt to 

 escape from the memory than favourable ones. Owing to this habit, very 

 few objections were raised against my views which 1 had not at least 

 noticed and attempted to answer." 



Most of the succeeding books of Darwin presented more fully data and 

 viewpoints which were summarized tersely in the "Origin," or were other- 

 wise supplementary to his great work. These include "The Fertilization 

 of Orchids," 1862; "The Variation of Plants and Animals under Domesti- 

 cation," 1868; "The Descent of Man," 1871; "The Expression of the Emo- 



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