1923] Kessel: Experimental Infection of Rats and Mice 



417 



4. Cysts of Edamoeba dijsentcriae were recovered from three rats 

 of this series, although the presence of such cysts had been overlooked, 

 but later found, in the stained slides of the human faecal material fed 

 to these animals. A light infection in man was thus detected by the 

 feeding experiment. 



TABLE 5 



Eesults Obtained from Feeding Eats with Cysts prom a Mixed Infection of 

 Endamoeba coli and Councilmania lapleuri 



5. Of the three rats infected with E. dysenteriae, one died of a 

 lung infection on June 12. The other two on that date showed cysts 

 in the faeces but were in apparent normal health. 



6. The faeces containing the cysts of E. dysenteriae were fed to 

 the rats January 5. As the rat faeces contained cysts of E. dysenteriae 

 in fair numbers on January 23, or eighteen days later, it may be 

 concluded that an infection of E: dysenteriae may be established in 

 rats within eighteen days after feeding them with the amoeba cysts. 

 It is highly probable that the infection was well established several 

 days before this time though an examination was not made. 



