CONTENTS
| Page. | |
| Introduction | [3] |
| Sewage, sewers, and sewerage defined | [1] |
| Nature and quantity of sewage | [2] |
| Sewage-borne diseases and their avoidance | [2] |
| How sewage decomposes | [5] |
| Importance of air in treatment of sewage | [7] |
| Practical utilities | [8] |
| Septic tanks | [21] |
| Grease traps | [43] |
| General procedure | [45] |