450 



M. R. CLARE. 



and 37. In the latter the relation of the metabolism curves for 

 the first day indicates that the excessive weight of the pupse in 

 question was due to the presence of a disproportionately great 

 amount of non-respiring material, let us suggest water. As pupal 

 development proceeded, this disproportion gradually became 



40 . 



30 . 



20 . 



10 - 



c 

 i 



N 



o 



I 



10 . 



30 . 



20 . 



10 . 



1st Day 



3rd Day 



2nd Day 



. 17 

 . 15 



. 13 

 . 11 



9 



II 



Q) <*- 



S / 



c / 







4th Day 



1 i i i i i i i i i i i i r 

 Vial Nos. 8 9 10 12 13 14, 15 16 18 19 21 28 37 8 



~i i i i i i i i i i i 

 10 12 13 14 15 16 18 19 27 28 37 



15 

 13 

 11 



FIG. 3. Modifications in metabolic rates and pupal weights during pupal life 

 for lots of pupae derived from a single mating, -2:4, at 25 C. Corresponding 

 values for each day of pupal life are connected into curves. Upper curve = Oz 

 per pupa; middle curve = Oa per gram and lower curve = pupal weights. Ordi- 

 nates at left are O2 values in cu. mm., at right are pupal weights in milligrams per 

 10 pupse. Abscissas are numbers of the vials from which experimental pupae were 

 obtained. Sex-ratios in brackets (males females). 



CL 



IL 



