162 PARASITIC AMCEB^E OF MAN. 



Amoebic abscesses may occur in other regions than 

 the liver; the amoeba? reaching the various organs by 

 way of the blood-vessels. Several authors have re- 

 ported the finding of amoebae in the blood, and un- 

 doubtedly a few such instances are authentic. 



The Production of Dysentery in Susceptible 

 Animals. Since the first description of amoeba? 

 various observers have succeeded in producing dysen- 

 tery in susceptible animals by rectal injection, or 

 feeding material containing amoebae from human 

 sources to such animals. Unfortunately all the work 

 along this line up to the time of Schaudinn's ob- 

 servations is inconclusive as regards the species of 

 amoebae used in the experiments, for while there is 

 no doubt but that pathogenic amoebae were employed 

 we are uncertain as to which pathogenic species the 

 experimenter was dealing with, and for this reason 

 these experiments cannot be used as proving the 

 pathogenicity of either Entamceba histolytica or 

 Entamceba tetragena. In all the early experiments 

 in which positive results were obtained amoeba? were 

 used which answer to the description of the patho- 

 genic species now recognized, and the experiments 

 proved beyond question that it is possible to produce 

 typical amoebic dysentery in susceptible animals with 

 such amoeba?. 



Since the observation of Schaudinn several ob- 



