Table of Contents 



Page 



I. Characteristics of the Colon Group of Bacteria 5 



II. Evidence of Two Subdivisions in the Colon Group and Tests for their Differen- 



tiation 17 



III. Classifications of the Colon Group of Bacteria 32 



IV. The Detection of the Colon Group in Water 43 



V. The Colon Group as an Index of Pollution 65 



VI. The Spore Forming Lactose Fermenters, and their Significance in Water Analysis 91 



Appendix A. Routine Methods of Water Analysis and the Colon Index 99 



Appendix B. Culture Media , 108 



References . -.119 



