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CAREY P. McCORD AND FLOYD P. ALLEN 



a brownish-black fatty mass with an odor suggestive of crude 

 fish oil. Portions of these extractives and the residue were 

 preserved intact for experimentation. Other portions of both 

 were reextracted with alcohol. Likewise fresh pineal material 



Sub.M. 



EpM. 



J 



Fig. 6 Surface view of integument from normal tadpole. On the left side 

 of the drawing the sub-epidermal connective tissue has been torn away, leav- 

 ing the epidermis alone. Thus on the right side both types of melanophores are 

 visible, on the left the epidermal type alone. The pigment granules in the sub- 

 epidermal melanophores are evenly distributed throughout the cytoplasm, illus- 

 trating the disperse phase. 



