PI.ATE 5 



EXPLANATION Or FIGURES 



22 The pigmentary system of a 46/0.1 albino frog tadpole, 'light and heat' 

 adapted. This tadpole was supplied with a posterior-lobe diet for 4M months. 

 Prior to fixation it had been on a Uver diet for one week. Fixed 43^ months after 

 epithelial hypophysectomy. X226. 



23 The pigmentary system of a 43/0.1 albino frog tadpole, 'light and heat' 

 adapted. This tadpole was supplied with a posterior-lobe diet for 3}4 months. 

 It had been on a liver diet for 5 weeks prior to fixation. Fixed by dropping into 

 Helly's fluid 4}^ months after epithelial hypophysectomy. X226. 



122 



