136 HUMAN INTESTINAL PROTOZOA IN THE NEAR EAST 



As nothing happened, a week later the injection was repeated. No 

 dysentery developed and no infection occurred. 



(4) A young kitten was given about five cubic centimetres of 

 [ faeces emulsion of case Carr with large infection of E. histolytica 



cysts. Case Carr had never suffered from dysentery. The emulsion 

 was administered by pouring it into the kitten's mouth. The 

 kitten with the mouth still soiled was placed in a cage with another 

 kitten. A week later both kittens became ill with acute dysentery, 

 from which they died. There were numerous E. histolytica in the 

 blood and mucus stools and extensive ulceration of the large 

 intestines. The experiment is of interest in showing that cysts 

 from a carrier who had no dysentery could produce acute dysentery 

 * in cats. The second kitten must have been infected by licking 

 cysts from the soiled mouth of the first cat. 



(5) A kitten was given per os on two occasions emulsion of 

 faeces of case Healy. There was a history of repeated attacks 

 of dysentery and numerous cysts and minute forms of E. histo- 

 lytica were present. The kitten did not become infected. In this 

 instance, though there was a definite dysentery history, no 

 infection of the kitten took place (compare Experiment 4). 



(6) A kitten was given on two occasions per os emulsion of 

 faeces of case Smith, who constantly suffered from amoebic dysentery, 

 there being present in the stool active amoebae, many of which 

 contained red blood corpuscles. Cysts of E. histolytica were never 

 found in this case during a long observation (see above). The 

 kitten did not develop dysentery and did not become infected. 



(7) Two white rats were fed on two successive days with faeces 

 emulsion containing numerous E. histolytica cysts. The rats did 

 not become infected and showed no signs of illness during an 

 observation of over two months. 



(8) A mouse was fed on several occasions with faeces of case 

 Healy containing numerous E. histolytica cysts. No infection and 

 no sign of illness was noted in an observation of over three months 



Tetramitus Mesnili. (1) A large quantity of emulsion of faeces 

 containing numerous free and encysted tetramitus was introduced 

 into the stomach of a kitten by means of a stomach tube. The 

 kitten never showe.d any tetramitus infection. 



(2) A mouse was fed on the same material but no infection 

 occurred. 



(3) A rat was similarly treated and likewise did not become 

 infected. 



Coccidia (Isospora). (1) A kitten was fed on several occasions 



