Coal, Smoke, and Sewage: Scientifically and Practically Considered (1857)

"The inevitable tendency of our Manufacturing and Commercial activities to concentrate our population in large masses ... has other results ... chief of these are the accumulation of solid, liquid, and gaseous excreta, resulting either directly or indirectly from human and animal life, and also the gaseous emanations from the various manufacturing and culinary processes so largely carried on where human beings are so densely massed together ..."