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. FLOW OF WATER IN RIVERS. During the past two years observations have been made under the direc- tion of the Superintendent of the Lake Survey, Gen. W. F. Reynolds, upon the flow of waters in the several rivers which connect the several lakes. The following are the results of last year's work: Maximum Mean Discharge ' RIVERS. * velocity. velocity. cubic feet. . Miles per Miles per' _-- per sec- hour. hour. ond. Sita Maki 6 ies herced acid gcn ata csins bl . 1.30 0.66 90,788 Bt. OLA. ou es su oe bs as ce ee es ee 3.09 2.39 233,726 Deroy ee ee ee 2.71 "2.04 - 286,000 Nibpared sup, ccidi orsiniawedsia co dkimes 2,32 1.54 242,494 Ct; APP OICG cio ds send 14 ue ee tk 1.00 0.65 319,943 The river gauging is under charge of D. Farrand Henry, Assistant Engi- meer of the Lake Survey Department, who, the Jowrnal of the Franklin Institute, from which we copy, says, "has conducted the work with much care and skill. He devised a 'telegraph current meter,' which is said to be more delicate and perfect than anything of the kind heretofore used, and hence the results will be of much value." ° Mr. Henry is a native of Detroit and a son of one of the early eminent medical practioners in this city. He entered this branch of the public service many years ago and devoted himself entirely to its interests.