114 PARASITIC AMOEBJE OF MAN. 



ENTAMCEBA HISTOLYT1CA. Schaudinn, 1903. 



This species was first differentiated by Schaudinn 

 in 1903, although it had been previously studied in 

 a thorough manner by Kartulis, Jiirgens, Council- 

 man and Lafleur, Strong and Musgrave, and many 

 others. It is a pathogenic species, causing amoebic 

 dysentery, its distribution probably being world-wide, 

 although it occurs most frequently in tropical and 

 sub-tropical regions. The pathological lesions 

 produced by it, as well as the experimental evidence, 

 prove conclusively that it is the cause of a distinct 

 form of dysentery which is endemic in many localities 

 and which may become epidemic when conditions are 

 favorable. 



GEOGRAPHICAL DISTRIBUTION. This species of 

 amoebae has been demonstrated in the Philippine 

 Islands, by Ashburn and myself, Vedder, and other 

 observers; in Formosa, by Nakagawa; in Cochin 

 China, by Pfuhl and other French investigators; in 

 Siam, by Wooley; in India, by Fearnside, Powell, 

 Rogers, Viereck and Duncan and Anderson; in 

 Africa, by Kartulis, Marchoux, Huge, A. Plehn, 

 Wellman, and Prout; in Europe, especially in Aus- 

 tria and Poland, by Hlava and many other observers; 

 in South America, by Dessy and Marotta; and in 

 the United States, by Osier, Musser, Dock, Ellis, 

 Tuttle, Boggs, Stockton, Patterson and others. 



