Constituents of the Great Lakes.

Issue 14 and Volume 44.

Constituents of the Great Lakes. About two years ago the United States geological survey began a study of the waters of the Great Lakes in connection with a rather extensive investigation of the economic value of surface waters in the United States. For a year a 1-gal. sample was collected each month and from each lake at a point where the water would probably represent the normal quality of the discharge. Samples of lake Superior water were taken from St. Mary’s river just above the locks at Sault Ste. Marie, Mich.; the lake Michigan samples were collected from a ferryboat in the straits of Mackinac; St. (flair river was sampled in mid-stream at Port Huron, Mich., lake Erie was sampled at the Buffalo waterworks intake; St. Lawrence river was sampled at Ogdensburg, and were analysed from one to three months after the date of collection. Suspended matter was removed before…

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