AMGEB.E OF THE INTESTINAL TRACT. 75 



20 healthy individuals, or 50 per cent., while Gassard 

 found 20 per cent, of infections in healthy individuals 

 in examining 20 cases. Strong and Musgrave found 

 amoebae in only 4 per cent, of healthy individuals, but 

 felt justified in believing that these amoebae were not 

 pathogenic because of the negative results of animal 

 experiments. Dock examined 200 healthy people and 

 only found amoebae in 2 cases. He concludes his con- 

 tribution to this subject as follows : "Even if a certain 

 parasite occurs in every case in one locality, it would 

 not follow that the same parasite would also be found 

 as widespread elsewhere." Schaudinn, in 1903, pub- 

 lished the results obtained by him in the examination 

 of the feces of healthy individuals. He found that 

 in West Prussia 50 per cent, of healthy men among 

 the farming population showed amoebae in their feces, 

 while in Berlin only 20 per cent, were found infected; 

 along the shores of the Adriatic Sea he found that 

 in 385 examinations of as many individuals in per- 

 fect health, no less than 256 or 66 per cent, showed 

 the presence of amoebae. His observations, as well 

 as those of others, demonstrate that locality and 

 occupation have much to do with the number of in- 

 dividuals infected. In all the cases of healthy in- 

 dividuals examined by him the amoebae found was 

 Ent amoeba coli. 



In 1905, I published the results obtained in 



