Mexico and the United States; a study of subjects affecting their political, commercial, and social relations, made with a view to their promotion: . , or feet below the bottom of the Aztec calendar stone, sincetransferred to the National Museum, but marked on the wall of theCathedral. The level of the ground at the beginning of the canal metres, or 24 feet 8 inches, and at the end metres, or 52 feetabove datum. The uniform slope of the canal is at the rate of o. 187 perkilometre. The canal has a depth, at its commencement, of metres, or 18feet, which in the last few ki
Mexico and the United States; a study of subjects affecting their political, commercial, and social relations, made with a view to their promotion: . , or feet below the bottom of the Aztec calendar stone, sincetransferred to the National Museum, but marked on the wall of theCathedral. The level of the ground at the beginning of the canal metres, or 24 feet 8 inches, and at the end metres, or 52 feetabove datum. The uniform slope of the canal is at the rate of o. 187 perkilometre. The canal has a depth, at its commencement, of metres, or 18feet, which in the last few kilometres is increased to metres, or 67feet 3 inches. The side slopes were projected with a batter of 45 ik-grees, and the width of the bottom is 5. metres, or 18 feet for the first20 kilometres, or 12^ miles, and metres or 21 feet 2 inches in the restof the canal. The first 20 kilometres, or 12^ miles,may be consideredas a prolongation of the net of sewers in the city, and will receive onlythe water that passes through them. The flow is calculated for anaverage of 5 cubic metres, or 176^ cubic feet, although, when heavy <<-?. f Drainage of the Valley of Mexico.)VERTICAL SECTION OF THE TUNNEL Ube Dalles of /IDejicos Drainage. 279 rains require it, they can receive a greater volume ; the rest of thecanal communicates with Lake Texcoco, and will be utilized in con-trolling its waters,—the lowest in the valley,—which can be made toflow into the canal from all parts. Hence the canal has been built tocarry the largest flow that can pass through the tunnel, or cubicmetres, 6i8fcubic feet, per second. The cutting is through a strictlyclay formation, comprising occasional thin strata of sand and sandstone. For accommodation of railroads, wagon roads, and water-courses,it was necessary to construct five aqueducts of iron to carry rivers,four iron bridges for the passage of railroads, and seven bridges forvehicular traffic. The sewage.—The sewers of the City of
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