330 TRK PRESKNCK, TYPK, ANO POSSinLE SIGNIFICANCE OF LACTOSE-FERMENTING BACILLI 



A 1) I) I T 1 N A I, EXPEIII M ENTS — contittued 



F. Aflcr iwpnuiiri' to siinliiiht for 30 dai/f. Temperature iif fivcal emnhion = 42' C. 



Group I, 1 Group II, 4 Group III, '^ Group IV, 2 



To determine the types of lactose fermenters in soil heavily polluted by human 

 excrement. 



-■1. Samples taken from a trench 24 hours old. Date, December 17. 



Group I, 2 



Group II, 3 



Group III. 2 



Group IV, 3 



