AMCEB^E OF THE INTESTINAL TRACT. 109 



ulcerations of the large bowel in cats by the injection 

 of the stools or contents of liver abscesses containing 

 motile amoebse dysenteric." 



The work of Jiirgens is of special interest in con- 

 nection with Entamceba coli. He demonstrated that 

 this parasite is not able to penetrate the normal mu- 

 cous membrane of the intestine because of the slight 

 strength of the pseudopodia and his observations have 

 been confirmed by Schaudinn. The latter observer 

 was unable to produce dysentery or any lesion of the 

 bowel in animals by feeding experiments or the rectal 

 injection of material containing Entamceba coU. He 

 was successful in infecting young cats and many of 

 his studies upon reproduction were made on amoebse 

 obtained from such animals, but the infection never 

 resulted in either symptoms or lesions of dysentery. 

 He twice infected himself by swallowing encysted 

 forms, in both instances the experiment being con- 

 trolled by regular examinations of his feces for two 

 months before the experiment. After swallowing the 

 cysts numerous amoebse appeared in his feces, but in 

 neither instance did any symptoms of diarrhoea or 

 dysentery develop and the amoebae gradually disap- 

 peared. 



My personal observations cover a large number of 

 experiments in which young kittens were used as the 

 animals experimented upon. I have injected into 



