This gorge is all within the limits of the city, the falls and rapids having a total descent of two hundred and sixty feet. This immense water-power, with the traffic facilities of canal and railway, have made the city, so that there is a population of a hundred and forty thousand around the Genesee Falls, and manufactures of flour, beer, clothing, leather and other articles, valued at $75,000,000 annually. In the neighboring region there is also extensive seed-growing, the Rochester nurseries occupying miles of the level surface. Rochester University has two hundred students and valuable geological collections. The city has been a headquarters for the Spiritualists and advocates of Women's Rights. The Genesee emerges from the rocky gorge below Rochester, and flows in more tranquil course northward through a ravine carved deeply into the table-land, to Lake Ontario, at the little port of Charlotte. LOCKPORT, CHAUTAUQUA AND ERIE. Westward from Rochester the country is underlaid by red sandstones, and at Medina quarries are plentiful, this reproduction of the Arabian "City of the Prophet" being an extensive supplier of these dark-red Medina sandstones, as the geologists call them. Beyond, at Lockport, the higher terrace is reached, and here the Erie Canal is raised by an imposing series of five double locks from the Genesee level up to the Lake Erie level. Through these locks and by means of a subsidiary canal an immense water-power is obtained which is utilized by the Lockport mills. The much lower Genesee level is marked by the base of a bluff, stretching through the town and across the adjacent region, evidently the bank of an ancient lake.