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90 a number of projects to this end were submitted, all of which received due attention, the viceroy joining personally in examination of ground. Several proposed a drain from Lake San Cristóbal through Rio Tequisquiac into the Pánuco, and Simon Mendez even urged the extension of the drain to Tezcuco Lake. He was allowed to begin the task, but its infeasibility must soon have become apparent, for it did not progress far. Another suggested that the underground passage into which the Teotihuacan rivulet disappeared might serve for outlet, and finally the Jesuit father Calderon revived the tradition of a natural sink in the bottom of Tezcuco Lake, between two rocks near Pantitlan. This received more attention than might be expected, and quite extensive examinations were made under the alluring offer of a hundred thousand pesos for its discovery.

None of the plans appearing to possess the merits of the Huehuetoca channel for efficacy and cheapness, a contract was made with Martinez for 200,000 pesos to put the tunnel in condition for carrying off the tributary waters of Zumpango and Citlaltepec lakes. The plan was deemed insufficient and work dragged slowly along both on the outlet, now destined to become an open cut, and on adjacent structures. The dam of San Cristóbal, protecting the Tezcuco from northern waters, was restored in a substantial manner; a tributary of Chalco Lake from the volcano range was diverted, and several minor dams were