E. histolytica: ileum 



in their intestine (in 27 cases). The ulcers were scat- 

 tered throughout the colon in 113 cases (60.7%) but in 

 63 cases (33.8%) were limited to certain regions. These 



\2'Bio 



sriio 



873/o 



Fig. 20. Appendix, colon and rectum of man showing the regional dis- 

 tribution of lesions in 63 cases of amoebic dysentery. (After Clark). 



regions are indicated in Fig. 20 ; they are dependent por- 

 tions where the greatest stasis exists, i.e., the cecum, 

 ascending colon, rectum, sigmoid and appendix. 



5. SECONDARY SITES OF INFECTION 



Infections in the ileum. E. histolytica has been noted 

 on several occasions anterior to the ileo-cecal valve. Cases 

 have been reported in man by Harris (1898), Kuenen 

 (1909), Allen (1924) and Craig (1926a). Craig states 



93 



