Plate II. 



Fig. 18. Photomicrograph. Cross-section of the duodenum of No. Ill, Fig. 

 2. X 165. 



Fig. 19. Photomicrograph. Cross-section of the duodenum of No. V, Fig. 

 2. X 165. 



Fig. 20. Photomicrograph. Cross-section of the duodenum of No. VI, Fig. 

 2. X 165. 



