TABLE XLI.-Showing the difference between the simultaneous readings of an evaporator at the meteorological station and one placed in the river St. Lawrence, 1868. The following tables are similar to those given last year, but corrected according to this year's observations. The outflow of the Ste. Marie is decreased 10 per cent., and the outflow of the Niagara corrected for the error arising from having only made observations during the summer months. This correction was made by taking the outflow for June as maximum for the year, and that the minimum was proportionate to the fall in the water at Buffalo. Section. The amount of rain-fall is taken from table XXXVII, and the evaporation from the Report on Meteorology, corrected by the ratio given in table. The outflow is a little less than half the total rain-fall, and a little more than half the rain-fall less the evaporation. This, as noticed in the last report, is very large, and would seem to indicate other sources of supply. TABLE XLII.-Showing the amount of rain-fall on lake surface and water shed, and the ratio between it and the outflow at the several stations, 1868. TABLE XLIII.-Showing the amount of rain-fall, less the evaporation from the lake surface, and the ratio between it and the out-flow at the several stations, 1868. 90, 505 0.0770 16, 190, 113, 632 187, 386 121, 941 0.0802 22,720, 125, 162 262, 964 450, 350 40, 298 216, 435 0.48 0.0892 8, 350, 931, 973 96, 654 547, 004 31, 558 0.0892 6, 539, 746, 667 75, 692 622, 696 272, 095 0.44 Evaporation from lake Rain-fall per second, Discharge per second in each sectioncubic feet. Ratio. I wish to express my thanks to my assistants for the faithful manner in which they performed their duties, and especially to Assistant Flint, without whose valuable aid, in the field and office, the work would have been much less complete. I hope, at the end of this season, to be able to report more fully in relation to the form of the curves, the agreement of the observations with the old formula, and on the pulsations. |