A quantity of water is withdrawn from the Canal by the Cooper Hydraulic Company and utilised under a fall of 12 feet around a lock, being then returned to the canal. At a point below a certain amount is again withdrawn from the canal, and after it has been employed for power under a fall of 8 feet, is discharged into the Miami river. The Hydraulic Company owns a part of the water, acquired by purchase, and also leases from the State, at an annual rental of 1000 dollars, all the surplus running to supply the levels below Dayton. On this privilege a “run” is defined as 315 cubic feet of water per minute on the “middle,” as it is called or 12 foot fall, and 400 cubic feet per minute on the “lower,” or 8 foot fall. A run at the middle fall was originally 300 cubic feet, but in consequence of slight backwater, it was increased to 315 cubic feet The rates for both temporary and permanent power vary from 150 dollars to 300 dollars per annum per run, but the larger portion is leased at 200 dollars per annum in the middle, and 150 dollars on the lower fall. From the basin at Dayton to low water in the Ohio river at Cincinnati, a distance of 66 miles, the canal descends about 300 feet, through 32 locks. Water for feeding the various levels south of Dayton is introduced at that city, Mamesburg, and Middletown. The manufacturing along this section is extensive, the paper and flouring industries being especially prominent. For the former of these, as now developed, however, the power furnished from the canal alone is not sufficiently reliable, and the mills are generally filled with steam engines for use when the water supply runs short. From the upper plane of the city of Cincinnati the canal descended formerly to the Ohio by means of ten locks, with a fall of 111 feet, measured to low water in the river. This terminal portion, though abandoned for navigation, is nevertheless utilised for power. Much of the way, it is covered from view, and in part of its course the water is divided between two separate channels. Water is used successively from one level to another, and is finally discharged into the Eggleston Avenue sewer. _The Morris Canal_, New Jersey, of which a profile is given at p. 206, is one of the most important in the United States. It was built originally to connect the Delaware River, with Newall. It was commenced in 1825 and opened to Jersey City in 1836. The summit level is 51 miles from tide water at Newall, and 39 miles from the Delaware River, being 914 feet above the former, and 760 feet above the latter. This elevation is overcome by 23 inclined planes, and 23 lift-locks. In 1841 the dimensions of the lift-locks were enlarged to 98 feet by 12 feet.