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University of California Puhlications in Zoology [Vol. 20 



Endamoeba coli infection is somewhat higher than in the first series 

 of fifty, but still considerably lower than the number of Councilmania 

 infections. As regards abundance of cysts, there are strikingly few 

 cysts in the great percentage of cases infected with Endamoeha coli, 

 while nearly 80 per cent of the cases infected with Councilmania show 

 abundance of cysts. In cases of E. coli infection, a smaller number 

 show absolutely no c.ysts staining at all. In many cases, however, 

 perhaps only two or three cysts showed any color, yet these cases were 

 classed as specimens showing color. In this second series Council - 

 mania again showed a preponderance of specimens in which cysts 

 take the Congo red stain. 



Four mixed cases of first series not recorded. 



In the total series of one hundred cases there were thirty-nine 

 cases showing E. coli infection; fifty-seven cases showing Council- 

 mania infection, and four cases with both E. coli and Councilmania. 



Table 6 



Action of Congo Bed on E. coli and Councilmania in Ninety-six Pure 



Infections 



Acknowledgments are made to the California State Board of 

 Health for the supply of material used, to the University of California 

 for assistance from the grant made in aid of research on human 

 intestinal protozoa, and for the use of the facilities of the proto- 

 zooiogical laboratory, to the China Medical Board for a fellowship 

 permitting this study, and to Professor Kofoid and Dr. Swezy for 

 counsel. 



