AM(EBJE OF THE INTESTINAL TRACT. 169 



but no ulcerations are present. Above the rectum 

 for a distance of about 10 cm. the mucous membrane 

 is very much swollen and cedematous, bright red in 

 color, and between the folds a considerable amount 

 of pus can be seen. For a distance of about 4 cm. 

 from the upper end of the large intestine, the mucous 

 membrane is inflamed, being red, swollen, and 

 oedematous. In this area there are numerous ulcera- 

 tions, covered in with bloody mucus ; they are of small 

 size, somewhat irregular in shape, and extend, in most 

 instances, to the submucosa, although there are a 

 few which extend to the muscular coat of the in- 

 testine; the edges are undermined and many of the 

 ulcers are covered with necrotic tissue, brownish yel- 

 low in color, which has to be removed in order to 

 expose them. A few of the ulcers communicate be- 

 neath the mucous membrane. The small intestine 

 shows a rather severe acute enteritis and the stomach 

 an acute gastritis. 



In this case the greatest number of ulcerations 

 occurred near the ileocaecal valve, while the rectum 

 escaped ; this is most unusual, as in the other success- 

 ful experiments by rectal injection the ulcerations 

 were generally confined to the rectum, at most in- 

 vading the intestine for a short distance only above 

 the rectum. 



At autopsy actively motile Entamceba histolytica 



