A Feature of The Sanitary Engineer is its replies to questions on topics that come within its scope, included in which are Water-supply, Sewerage, Sewage Disposal, Ventilation, Heating, Lighting, House-drainage, and Plumbing.

Repeated inquiries concerning matters often explained in its columns suggested the desirability of putting in a convenient form for reference a selection from its pages of questions and comments on various problems met with in house-drainage and plumbing, improper work being illustrated and explained as well as correct methods.

It is therefore hoped that this book will be useful to those interested in this branch of sanitary engineering.