GENr-l 



IDT. 



99 



,GEN 

 DTVJ 



CHART i. Percentage of deficient offspring according to age of mothers. 

 Culture vials through which mothers were successively transferred are denoted by 

 a, b, c, d, e, f, g. Mothers remained in each vial between four and five days. Gen. 

 Ant. and Gen. Dt. denote offspring from mothers of strains in which deficiency in 

 genitalia was associated with deficiency in antennae and in digestive tract respec- 

 tively. For actual numbers see Tables A and D. 



