(72.8%) but much less frequent in the cow (30%) and pig (29%); 

 whereas in sewage and man it was relatively rare (7.7 and 8% respectively). 



TABLE L. DISTRIBUTION OF ORGANISMS FROM DIFFERENT SOURCES 

 AMONG THE VARIOUS SPECIES AND VARIETIES. 



The Bact. neopolitanum was present only in bovine feces and sewage, 

 comprising 20 percent of the bovine and 7.7 percent of the sewage. 



Bact. coscoroba occurred as follows: sheep 22.7 percent, pig 3.2 per- 

 cent, sewage 5.1 percent and human 4.0 percent. 



The relation of sucrose fermentation and the source is especially em- 

 phasized. The sucrose fermenting strains are relatively uncommon in 

 human feces, whereas they constitute the predominating type in animal 

 feces and in the soil. This low incidence in human feces is confirmatory 

 of the observations of numerous other investigators. 



In this connection, it may be well to recall that when Durham sug- 

 gested the name B. coli communior for the sucrose fermenting variety be- 

 cause of its greater prevalence, his observations were based on the intestinal 

 contents of animals for which this fact holds true, but, as has been pointed 

 out above, the sucrose positive strains are relatively scarce in man. 



Bact. coli, like Bact. communior was isolated from all of the sources 

 tested, but a rather distinct correlation with the source is observed with 

 the varieties Bact. coli-communis and Bact. coli-immobilis. The former 

 comprise" 1.1 percent of soil; 21 percent of horse; 4.5 percent of sheep; 

 45 percent of cow; 35.6 percent of pig; 2.6 percent of sewage; and 20 

 percent of human strains. Bact. coli-immobilis was not obtained from 



