BACTERIOLOGICAL ANALYSIS OF SEWAGE 231 



peptone solution, dextrose, lactose and saccharose fermenta- 

 tion tubes, and esculin bile, for identification. 



12. Test the gas for H and CO2 and record the ratio. 



3 Kf) K^" 



O rj 



*! 



^ I 

 O I. 



13. Transfer B. coli, Bad. aerogenes and B. typhosus 

 to the same media and compare their cultural character- 

 istics with those of organisms isolated. 



14. Determine whether the organisms are Gram-posi- 

 tive or -negative. 



