THEORY OF RESULTS 219 



of the experiment illustrated on Plate IV., and 

 interpreted on p. 226. 



I mention these facts and their possible inter- 

 pretation merely to show the reader that results 

 which, in the mind of a casual observer, may appear 

 to be incompatible with the doctrine of gametic 

 purity do not in fact bear on it one way or the 

 other. 



In this chapter attention has been paid to two 

 pairs of characters in which neither of the characters 

 of one pair exert any effect on either of those of the 

 other. The theory to be enunciated in the next 

 chapter is based on the fact that the dominant 

 member of one pair exerts a very profound effect 

 on the dominant member of another pair ; it is a 

 necessary condition of its visible existence. 



