introduce sixteen million of gallons into the city of New York, at an elevation of 125 feet above low water, (see Corporation Document, No.54 ;) he presented another communication on the 6th of January, 1834, objecting to the plan proposed by our engineer in " that the most serious 1833, for conducting the waters of the Croton to the city, stating, objection he has to urge against the plan is, that the water, however pure it may be at the fountain head, must inevitably become contaminated with some deleterious substance passing over such a variety of soils, and amalgamating so many mineral substances." He then proposes constructing a dam near the Quaker Bridge, on the Croton river, 45 feet high, which will give an elevation or head of 125 feet above tide of the Hudson ; " from this dam the pipes will rise gradually until they pass Sing Sing," and from thence descend to the shores of the he " forms almost a line Hudson, which, (as states) straight to the city, and very few obstacles to overcome the Harlem river will be crossed at very ;

little expense." (See Document, No. 57.) On the 20th of January, 1834, Mr. Rhodes addressed a letter to the Chairman of the Commissioners, in which he says, " The natural abutments and high hills

MEMOIR OF THE near the Quaker Bridge, will give an elevation of 200 feet above the tide, if required. The canal to Sleepy Hollow will be on a level with the dam, which gives us the same head at Sleepy Hollow as we have at the dam. By my plan we arrive at Sleepy Hollow, travelling only eight miles with the whole of the Croton."