PINEAL GLAND FUNCTION 



217 



Ep.M. 



Fig. 7 Similar view of integument from tadpole fixed 30 minutes after feed- 

 ing acetone extract of pineal gland. In this case the pigment granules in the 

 subepidermal melanophores are collected into a mass in the centre of the cell— 

 the aggregate phase. 



The material was fixed in Bouin's fluid, dehydrated, cleared in xylol and 

 mounted without staining in balsam. The drawings were made with the aid 

 of an Abbe camera lucida, with Leitz objective 6 and ocular 4, giving an approxi- 

 mate magnification of 590 diameters, but have been reduced | for publication. 

 All material was taken from the region between the eyes. 



