86 



THE VITAMINES 



PCR/0D A4 



n H f 



Hi 



PERIOD 



ff H ft f} f 



FIG. a 



FIG. 6. GROWTH OF FROG LARVAE 



Diet Hi contained A- and B-vitamines, while diet II 2 was lacking in B- 

 vitamine (Emmett-Allen). 



FIG. 7. GROWTH OF FROG LARVAE 



Diet Ilia was complete while diet Viz was deficient in vitamines 

 (Emmett-Allen). 



