ILLUSTRATIONS/ 



Plate I. Colon. Thin-walled gut, with shallow ulcers, some slightly 

 undermined, others punched out. 

 II. Sigmoid. Irregular ulceration with diphtheritis. 



III. Colon, A moderately thickened gut with various types of 



ulcers. 



IV. Caecum. Marked degree of disorganization of the bowel with 



shreds of muscularis and submucosa. Perforation. 

 V. Eectum. Extensive ulceration and diphtheritis. Thick-walled 

 gut. 

 VI. Colon. Various stages of ulceration. 



VII. Colon. Extensive distribution of punched-out ulcers, some 

 slightly undermined. 

 VIII. Colon. Thickened bowel with some large ulcers and some 

 very early ones. 

 IX. Early intestinal lesion. Shows superficial necrosis, glandular 

 distortion, and round-cell infiltration. Borrel's stain. 

 (Zeiss objective AA, compensation ocular No. 4, bellows 

 at 30 centimeters.) 

 X. Early lesion. Extending necrosis, destruction of glandular 

 epithelium, invasion of amcebse, and round-cell infiltration. 

 Borrel's stain. (Zeiss objective AA, compensation ocular 

 No. 4, bellows at 50 centimeters.) 

 XI. Submucosa in an early lesion. Borrel's stain. (Zeiss objective 



AA, compensation ocular No. 4, bellows at 30 centimeters.) 

 XII. Thrombosis of blood vessels of the mucous membrane of the 

 colon. Borrel's stain. (Zeiss objective DD, compensation 

 ocular No. 4, bellows at 50 centimeters.) 

 XIII. Amcebiie in the muscularis mucosa. The section is the same 



as that sho^ni in Plate X. (X 500.) 

 XIV. Amcebaj in an area of hemorrhage in the submucosa. Borrel's 

 stain. (X 500.) 

 XV. Amoebae in n blood vessel. (X 500.) Heidenhain's iron 

 hematoxylin. 

 XVI. Amoebae in a blood vessel. Borrel's stain. (X 500.) 

 XVII. Amoebae in the lymph spaces of the submucosa. Borrel's stain. 

 (X 500.) 

 XVIII-XXI. Amoebae in tissues. Borrel's stain. (X 1400.) 



XXII. Amoebae from a culture. Impression preparation. Borrel's 



stain. (X 500.) 

 XXIII. Ibid. (X 1400.) 



^ The photographs and photomicrographs were made by Mr. Martin, the 

 photographer of the Bureau. 



48 



