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To condense a large amount of information in a few pages, so as to make it interesting as well as intelligent, is a work requiring patience and diligence. While the work may be of little service to the profession, it is hoped those connected with water-works and the general reader will find sufficient compensation for the time lost in its perusal.

The authorities quoted are the highest, and the general facts are from the most reliable sources. Considerable space is given to pollution of water, believing it to be the most important question that bears on the subject before us. Water-works officials will find useful information in the work, which is so frequently desired and sometimes difficult to obtain.

Due acknowledgments are made for information derived from the following works: Rivers Pollution Commission, (London,) 1874; Humber’s Water Supply of Cities and Towns; Fanning’s Water Supply Engineering, (New York,) 1876; History and Statistics of American Water-Works, by J. James R. Croes, C. E., Engineering News, (New York,) 1881; Hughes’ Water-Works, Weale Series; Hydraulic Engineering, Weale Series; Die Städtische Wasserversorgung, Von E. Grahn, (München,) 1878; Practical Hydraulics, by Thomas Box, (London,) 1873; Kirkwood’s Filtration of River Waters, (New York,) 1869; Ohio State Geological Works, 1870; U. S. Census Reports, 1881; The National Board of Health Bulletins; The Sanitary Engineer and Engineering News; Catch Water Reservoirs, by C. H. Beloe, London.