TRANSCRIBER’S NOTE The Table of Contents has been created by the transcriber, and is placed in the public domain. Italic text is denoted by _underscores_. Table footnotes are denoted by [number], and the footnotes have been placed under the table where they occur, as in the original text. Footnote [6] is referenced four times from the table on page 62. Footnote [7] is referenced four times from the table on page 63. Basic fractions are displayed as ½ ⅓ ¼ etc; other fractions are shown in the form a-b, for example 7-16 or 25-32, as in the original text. Some wide tables have been split into two parts, with the first column repeated. All tables are displayed best if a monospace font is used. The Table of Contents has been created by the transcriber, and is placed in the public domain. Minor changes to the text are noted at the end of the book. HISTORY OF THE WATER SUPPLY OF THE WORLD, ARRANGED IN A COMPREHENSIVE FORM FROM EMINENT AUTHORITIES, CONTAINING A DESCRIPTION OF THE VARIOUS METHODS OF WATER SUPPLY, POLLUTION AND PURIFICATION OF WATERS, AND SANITARY EFFECTS, WITH ANALYSES OF POTABLE WATERS, ALSO GEOLOGY AND WATER STRATA OF HAMILTON COUNTY, OHIO, STATISTICS OF THE OHIO RIVER, PROPOSED WATER SUPPLY OF CINCINNATI--TOGETHER WITH A NUMBER OF VALUABLE TABLES AND DIAGRAMS. BY THOMAS J. BELL, _Assistant Superintendent of the Cincinnati Water-Works_. CINCINNATI: PETER G. THOMSON, PUBLISHER. 1882. COPYRIGHT, 1882, BY PETER G. THOMSON. CONTENTS PAGE Chapter I. 5 Chapter II. River Pollution. 15 Chapter III. Purification of Waters. 27 Chapter IV. System of Supply. 36 Chapter V. Historical and Statistical. 68 Chapter VI. Other Articles. 92 Chapter VII. Cost of Constructing Water-Works. 125 INDEX. 132 INTRODUCTION. The original intention of this work was to arrange a treatise, in the form of a compilation, of general and local information on water supply, in all its bearings, with special reference to Cincinnati, in view of the fact that the question of a new supply would become an important one when the “Markley Farm Project” presented a more tangible form.