OF THE ALIMENTARY TRACT 



47 



the typical form described in the trophozoite, the 

 chromidial bodies black or dark brown bars or rods 

 with blunt or tapering ends. 



Fl(i.2. — Kiuldinoi h(i Itlslolj/lica. 



A, precystic stage. B, cyst with two nuclei and chromatoidal bar. 

 C, cyst with four nuclei and chromatoidal bar. D, trophozoite with 

 ingested blood corpuscles. Photomicrographs of specimens from 

 man. A, B and C from chronic intestinal amoebiasis, D from 

 amoebic dysentery, stained by iron-haematoxylon. x 1500. 



PREVALENCE, DISTRIBUTION AND TRANSMISSION 



Endamoeha histolytica, once thought to be of im- 

 portance only in the tropics, is of world-wide distribu- 



