Issue 3 and Volume 30.

SUCCESS OF MECHANICAL FILTER AT ELMIRA. BY JAMES M. CAIRD, CHEMICAL BACTERIOLOGIST. THE Chemung river to formed by the uniting Of the Tioga and Cohocton rivers, nineteen miles above Elmira. The Chemung river is about fifty miles in length, and flows into the north branch of the Susquehanna. The Tioga river rises in the coal district of Pennsylvania, and has an average descent of seventeen feet per mile. TheCohooton river has only a slight descent. The slope of the Chemung river from Painted Post to Elmira is at the rate of 5.9 feet per mile; it then flows through the city of Elmira, or three miles at the rate of 3.5 feet per mile. The river to subject to severe floods; at times the water rises eighteen feet. The area drained above Elmira by the Chemung river and its tributaries is about 2,050 square miles. On examining the polluting territory…

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