Transactions . inIllinois, and has been the occasion of many investigations, un-dertaken either for the discovery of sources of a better supply,or for the purification of the supplies already at hand. LOCATION OF SUPPLIES. The sources of supply of which this paper treats lie along theright of way of the Chicago, Burlington and Quincy RailroadCompany, and form a nearly straight line from Chicago, Illi-nois, on Lake Michigan, to Burlington, Iowa, on the Missis-sippi River. The supplies consist of surface-, ground- anddeep well-waters; their locations are given in Fig. 1, which isadapted from a m
Transactions . inIllinois, and has been the occasion of many investigations, un-dertaken either for the discovery of sources of a better supply,or for the purification of the supplies already at hand. LOCATION OF SUPPLIES. The sources of supply of which this paper treats lie along theright of way of the Chicago, Burlington and Quincy RailroadCompany, and form a nearly straight line from Chicago, Illi-nois, on Lake Michigan, to Burlington, Iowa, on the Missis-sippi River. The supplies consist of surface-, ground- anddeep well-waters; their locations are given in Fig. 1, which isadapted from a map of Illinois published by the Illinois RailroadCommissioners. The influence of the geological formation on the water-supplyof Illinois is fully treated in an article in the Seventeenth AnnualReport of the IT. S. Geological Survey by Mr. Frank Leverett,entitled, The Water-Resources of Illinois. It is not thepurpose of this paper to introduce a geological discussion; and THE QUALITY OF BOILER-WATER SUPPLY. 131. 132 THE QUALITY OF BOILER-WATER SUPPLY. mention will be made of those formations only which furnishthe water-supplies herein treated. The surface-waters are derived from the drainage of thewater-shed and from springs. The surface of that portion ofthe State which furnishes these waters consists of glacial ridges,till-plains and loess-covered till; the water partaking of thesoluble portions of these formations. No separate study hasbeen made of the spring-waters; but they can probably beclassed with the ground-waters. The ground-waters are derived from glacial drift, whichcovers the older rock to a depth of from 10 to 200 feet. Thedrift is of very variable composition : in some portions it con-sists of clean gravel; in other portions, of various mixtures ofclay of several varieties, gravel, boulders, or sand. It is thisgreat variation that makes the composition of the ground-watersso uncertain. The deep well-waters are all from the St. Peters formation occu
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