AMCEBJE OF THE INTESTINAL TRACT. 167 



injected into the rectum. The negative results may 

 be explained by the absence of the infective spores, 

 for while motile amoebae were present in all the ma- 

 terial used, some of it was not examined for spores, 

 as at the time I was inclined to believe that the 

 vegetative stages of this species could produce in- 

 fection. 



In experimental dysentery produced in kittens by 

 the rectal injection of infected material the lesions 

 tend to be localized in the rectum, and are not so 

 severe as when the infection is acquired through the 

 mouth. The incubation period varies from 6 days to 

 nearly two weeks, being longer on the average than 

 in the feeding experiments. The lesions produced 

 were typical of those occurring in amoebic dysentery 

 in man and varied in extent and severity with the 

 length of time the infection lasted. 



It is not necessary at this time to give in detail all 

 of the autopsy records of the experimental work just 

 mentioned, but I shall quote here in full the autopsy 

 record of a case of dysentery produced in a kitten by 

 rectal injection as it is characteristic of the findings 

 obtained in all the cases, the only difference being 

 in the severity and extent of the lesions. This kitten 

 was given a rectal injection of 5 c.c. of feces from a 

 case of dysentery contracted in the Philippine Islands, 

 the date of injection being October 19. Upon 



