VAEIATIONS IN POTENCY 



they do not reduce the whole art of breeding 

 to the production of new combinations of unit 

 characters through crossing. Selection is re- 

 quired also, not merely among different combi- 

 nations of unit-characters, but also among in- 

 dividuals representing the same combinations 

 selection is required of those possessing the 

 desired characters in greatest potency. The 

 further r6le of selection in evolution we shall 

 need to consider in a subsequent chapter. 



BIBLIOGEAPHY 



Castle, W. E., and Little, C. C. 



1909. "The Peculiar Inheritance of Pink Eyes Among 

 Colored Mice." Science, N. S., 30, pp. 312-314. 



COUTAGNE, G. 



1902. "Recherches exp^rimentales sur I'h^r^dit^ chez les 

 vers-a-soie." Bull. Sci., 37, pp. 1-194, 9 pi. 

 Morgan, T. H. 

 1909. "Breeding Experiments with Rats." American 

 Naturalist, 43, pp. 182-185. 

 De Vkies, H. 

 1901-03. "Die Mutationstheorie." Leipzig, Veit and Co. 



See also the Bibliographies to Chapters IIL, IV., and V. 



