RESPIRATORY METABOLISM. 9 



sented here are those obtained by using lots of five and ten pupae 

 at one time and making determinations daily throughout pupal 

 life. The pupa in all cases had been under identical environ- 

 mental conditions and were of the same age. In running through 

 any two series, i.e., wild and vestigial, from the first day to the 

 time of emergence, the same manometer was used for each, so 

 that any possible error in the calibration of instruments would 

 not enter into experiments dealing with the relative respiratory 

 rates of the two stocks. 









MGS 



Time hrs. 



i lab ' "40 IBO i ' 



F; ii consumption (mg.) per nig. body weight per hour 



f"r \vi',l :m.l pupae during entire pupal life. Ordinate represents 



weight per hour, abscissa time in hours indicated. 



a = wild ; / al. Solid horizontal portions of curves indicate time 



during whii ^-terminations were made. 



Table 11. ;m<! 1 :g. 4, selected from many experiments, show the 

 i-.insumptinn for pupse of the two stocks. From an exam- 

 ination of these it is evident that the rates of oxygen consumption 

 for the two stocks are quite similar. In both stocks there is a de- 

 rided decrease in oxygen consumption the second day followed by 

 a gradual iiuTea-e up to the time of hatching. The rate of oxy- 

 gen consumption the fifth day usually exceeds that for the first 

 da\ . 



