A STUDY OF OXYGEN METABOLISM. 



455 



TABLE IV. 



SEX AND PUPAL WEIGHTS. 



Pupal weights are stated in milligrams for lots of 10 pupae. 



First Day. 



Second Dav. 



Third Day. 



records do, however, suggest a tendency for larvae destined to 

 become females to pupate earlier than those which will develop 

 into males. Also, as is shown in Table IV., pupae which are to 

 become females incline toward heavier weight than those which 

 become males. 



The sex ratios for a typical series of determinations have been 

 indicated in Fig. 5 as well as in Fig. 3. All of the data have 

 30 



