24 



T a 11 a k a. 



The removal between the calculated and the observed is, certainly, 

 not very large. We should be content, therefore, with the above as- 

 sumption so far as the breeding experiments are confined inter se. But 

 this was, as elsewhere stated, not sufficient for a critical study of 

 gametic distribution. 



In the hope to reveal more distinctly the genetic interrelation 

 of M and F, crosses were made between mymy female and MYmy male, 

 the offspring being reared during the summer 1913. 



From these results it is obvious that the coupling in the male 

 gametes produced by diheterozygous moricaud yellows (MYmy) occurs 

 on the system 3 : 1 : 1 : 3, in an example possibly on the 2:1:1:2 system. 



One (H. 56) of two families given below is produced by crossing 

 a striped white (heteroz. in marking) 9 to moricaud yellow (heteroz. in 



