lODAMCEBA OF ANIMALS 



247 



properties. Kessel (1923a, 1924ft) states that he has infected rats and 

 monkeys with /. hutschlii. 



On two occasions, by inoculating Boeck and Drbohlov's medium with 

 faeces containing cysts of /. hutschlii, Thomson and Robertson (1925) 

 obtained cultures of amoebae which appeared to belong to this species. 

 One strain was maintained for forty-six days with forty subcultures. 

 No cysts were found in the cultures. 



lODAMCEBA OF ANIMALS. 



O'Connor (1920) describes an amoeba which he found in pigs in the 

 Ellice Islands. Both free and encysted forms occurred, and save for the 

 presence of numerous irregular bodies of chromatoid or volutin nature, 



Fig. 115. — Cysts of lodamceha of tue Pig {xca. 1,400), drawn from an Iodine 

 Preparation, showing Marked Variation in Shape and Absence of Iodo- 

 PHiLic Body in Some Cysts. (Original.) 



they bore a striking resemblance to 7. hutschlii. The name /. suis was 

 suggested, though no data for distinguishing it from the human parasite 

 were given. Noller (1921), who has studied several cases of infection with 

 this amoeba in men in Hamburg, stated that Feibel has noted that at 

 least 20 per cent, of the pigs slaughtered in Hamburg abattoirs had 

 /. hutschlii in their intestines. In the same year Cauchemez discovered the 

 organism in pigs in France. He concludes that these animals are probably 

 the reservoirs from which human beings become infected. Feibel (1922) 

 has given an account of the observations referred to by Noller. The 

 writer has on several occasions seen the cysts of this parasite in faeces of 

 pigs in England (Fig. 115). 



