(Jan. 3.43 × .3421 = 1.173) × 360.4 × 17,378,000 - 268,600,000 = 7,077,700,000 (Feb. 3.40 × ” = 1.163) × ” × ” - 293,800,000 = 6,989,900,000 (Mar. 3.90 × ” = 1.334) × ” × ” - 475,700,000 = 7,879,000,000 (April 3.57 × ” = 1.221) × ” × ” - 831,000,000 = 6,816,000,000 (May 1.04 × ” = .356) × ” × ” - 1,247,900,000 = 982,000,000 (June 1.40 × ” = .479) × ” × ” - 1,550,100,000 = 1,449,800,000 (July 5.86 × ” = 2.005) × ” × ” - 1,673,200,000 = 10,890,000,000 (Aug. 4.16 × ” = 1.423) × ” × ” - 1,538,900,000 = 7,373,100,000 (Sept. 2.42 × ” = .828) × ” × ” - 1,152,800,000 = 4,032,900,000 (Oct. 2.83 × ” = .968) × ” × ” - 884,200,000 = 5,178,500,000 (Nov. 2.32 × ” = .794) × ” × ” - 629,600,000 = 4,343,100,000 (Dec. 2.59 × ” = .886) × ” × ” - 422,500,000 = 5,126,300,000 ----- 36.92 The sum of the twelve monthly available quantities will give the total number of gallons per year applicable to meeting the water demands of the boroughs of Bronx and Manhattan. =174. Necessary Storage for New York Supply to Compensate for Deficiency.=—At the present time the average daily consumption per inhabitant of those two boroughs is 115 gallons, and if the total population be taken at 2,200,000, the total daily consumption will be 2,200,000 × 115 = 253,000,000 gallons. If the latter quantity be multiplied by 30.5, the latter being taken as the average number of days in the month throughout the year, the average monthly draft of water for the two boroughs in question will be 7,716,500,000 gallons. The subtraction of the latter quantity from the monthly results in the preceding table will exhibit a deficiency which must be met by storage or a surplus available for storage. Table XIII exhibits the twelve monthly differences of that character. TABLE XIII.