A Modification of the Sex-Ratio, and of otlu-r Ratios, etc. 



325 



mentary, the rudimentary wing will be Rm. Expressed in the same 

 terms the long wing will occur when both M and R are present. 



I have shown, for example, that when miniature males are bred 

 to normal or long-winged females all of the offspring have long wings. 

 If these are inbred there are produced in the Fo generation the 

 following classes: — Females with long wings; males with long wings; 



