SEX-LINKED LETHALS IN DROSOPHILA 



99 



red-long class, which is the lethal class and, as will appear, also 

 the double cross-over class. 



One of the single cross-over classes is red miniature; the other, 

 white long. Both are smaller than the non-cross-over class, white 

 miniature. 



TABLE 11 



(From No. 12 of table 10) 



