1. The bacteria of natural waters 2. The collection of samples for bacteriological examination of water 3. Determination of the number of organisms developing at room temperature 4. The interpretation of counts of bacteria developing of gelatin or agar plates at 20o C 5. Determination of the number of organisms developing at body temperature 6. Coliform organisms and methods for their detection 7. The coliform group and the presumptive test 8. Coliform organisms and methods for their detection 9. Confirmation of the presence of coliforms 10. Differentiation of organisms of the coliform group 11. Significance of the presence of coliform organisms in water 12. Other intestinal bacteria which have been used as indices of pollution 13. The significance and applicability of the bacteriological examination 14. Bacteriology of sewage and sewage effluents 15. Bacteriological examination of shellfish