O In absolute mgms. per embryo per day present 

 • In absolute mgms.excreted per embryo per day 



• ^ » ADULT 



V» O *0-0-LEVEL 



Fig. 319- 



Fig. 320. 



Days 



Fig. 321. 



Days 



Fig. 322. 



Figs. 318, 319 and 323 are smoothed curves. 



