PLATE 1 



EXPLANATION OF FIGURES 



*1 Benda fixation and stain. Mitochondria, and fibrils of myoid cell. X 1000; 

 camera lucida. 



2 Benda fixation and stain. Granulae of small thymus cells. X 1000. 



3 Epithelial cell complex from medulla. Granulae and droplets. Benda 

 fixation and stain. X 1000. 



4 Cell complex from medulla, containing granulae and irregular masses of 

 gentianophile substance. Benda fixation and stain. X 1000. 



326 



