A. H. Trow 



This case may be represented diagrammatically ; thus 



317 



;i//( Abe 



«AbC 



abC 



naBc 



/imaBC 



Since n and m are each greater than one, it may be shewn that 



1 "J- Tiin 



whether n is equal to, greater than or less than m, is greater 



^ ° m + n '^ 



than one, and therefore that the type of reduplication between B and 



C is of the nature of a coupling. We have therefore established the 



rule that reduplications between A and B and between A and C 



whether of the form of couplings or of repulsions, give rise to a 



secondary reduplication between B and C of the form of a coupling. 



We may now consider the case in which the types of reduplication 

 between A and B and between A and C belong to the series n : 1 : 1 : n 

 and 1 : wi : m : 1 respectively. The gametic series in this case will be 



7iABC + nmABc + AbC + mAbc + maBC + aBc + mnSibC + nabc, 



and the reduplication between B and C will be necessarily of the form 



BC : Be : bC : be :: n + 7/1 : nm + 1 : 1 -\- nm : m + n, 



