APPENDIX. 71 



from Emery, 1 who says : "Some pupils of Darwin 

 have gone beyond their master and discovered in nat- 

 ural selection the sole and universal factor control- 

 ling variations. Thus there has arisen in the natural 

 course of things a reaction, especially on the part of 

 those who, while they accept evolution, will have 

 naught to do with natural selection or Darwinism as 

 they call it." Emery then professes himself a Darwin- 

 ian, although not in the sense of Wallace and "other 

 co-workers and pupils of Darwin." For him "natural 

 selection is a very important factor in evolution, and 

 in determining the direction of variation plays the 

 highest part; but it is far from being the only factor 

 and is probably also not the most efficient factor." Not 

 the most efficient factor but plays the highest part! 



II. CHEMICAL SELECTION. 



If we refer adaptation to selection, we have also to 

 trace back to this source the origin of the organic com- 

 binations which make up the various tissues of the 

 body and which go by the collective name of muscular, 

 nervous, glandular substance, etc. Lloyd Morgan has 

 prettily likened the vital processes to the periodic for- 

 mation and discharge of explosive substances. 2 Un- 

 stable combinations are upon the application of a 



it to myself, in spite of this occurrence, to make public the 

 foregoing facts, in order," etc. Any one who is interested in 

 knowing the motives of Herr Eimer's excuse may find them in 

 his book Artbildung und Verwandtschaft bci den Schmctter- 

 lingcn, Part II., p. 66. 



1 "Gedanken zur Descendenz- und Vererbungstheorie." 

 Biolog. Centralblatt, July 15, 1893. 



2 C. Lloyd Morgan, Animal Life and Intelligence, London, 

 1890-1891, p. 3-33- 



