142 



HUMAN INTESTINAL PROTOZOA IN THE NEAR EAST 



as we have done affords a very simple method for detecting to what 

 extent flies in any locality are infecting themselves through having 

 access to faeces. Further, it is indirectly an indication of the 

 efficiency of the sanitary arrangements in any neighbourhood 

 where human beings are infected with organisms which can be 

 recognized microscopically in the stool. 



It is impossible to give a complete record of all the flies 

 examined with the number of droppings passed by them, and 

 the time occupied. This will be done only for the flies which 

 were found to be positive by way of illustrating the records which 

 have been kept. (See Table.) 



TABLE SHOWING RESULTS OF EXAMINATION OP 18 POSITIVE FLIES OUT OF A 



TOTAL OF 229. 



All the above flies were caught in the hospital compound, and 

 many of them in the neighbourhood of, or actually inside, the 

 cook-house, which was built against a wall separating the hospital 

 compound from a native village. This village was in a filthy con- 

 dition, and the natives were constantly depositing faeces along the 

 front of this wall. It seems clear that the flies must have become 

 infected in the village on the other side of the wall. 



