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66 DETROIT RIVER. above lake level, 150 yards S. by W. } W. from front light. These lights in range lead through Lime-kiln crossing channel. The Straight Cut at the Lime-kiln Crossing.--This very important improvement is so far advanced that the channel will be given up to commerce on the opening of navigation. A strip on the east side of the channel still remains to be deepened, which can be done without interruption. The cut is 2,500 feet in length, 20 feet deep, and when completed will be 300 feet wide at its narrowest part. The Canadian Government has made an ap- propriation to build range lights at Fort Malden, the upper end of Amherstburg, which will guide through the center of the; cut un- til they are in operation, the range lights on Bois Blane will lead through this channel. Follow the east shore of Bois Blanc island until the range line is reached, to guide through the cut, at the Lime-kiln cross- ing. After passing the Lime-kilns, get on the range of the lower end of the Canada Southern Railroad wharf, and the Wyandotte Rolling mills, N. by W. $ W., which leads to the range of Mama- juda and Grassy Island lights. Haul up on this range N. gE. (A good opportunity is afforded vessel masters while running on this range to test the working of their compasses, the course is between N. 2 E. and N.4E.) When within about 300 yards of the light- house, bear to eastward slightly to clear Mamajuda shoal, and when 700 yards above the light, the range between it and Grassy island may again be taken. Arriving within one-half mile of Grassy Island light, haul to eastward to clear it, and when 600 yards above, again take the range until upper end of Fighting island 1s reached, when steer up river in mid-channel. Grosse Isle Flats.--Black spar buoy in 14 feet of water. Stands in sandy bottom, at the elbow of the flats, west side of channel, 24 miles above Lime-kiln crossing. Below this buoy the flat trends S. 4 E. two-thirds way to Stony island, and thence to the outer end of the railroad-ferry wharf on the island; above it trends in towards the Grosse Isle shore, and, from half a mile above this buoy, the channel lies close to that shore. Width of channel in this stretch, one-third to one-half mile. Mamajuda light-house, N. 4 W., 24 miles. Fighting Island.--Red spar buoy in 94 feet of water. Hast side of channel, and marks the outer edge of the bank, at lower end of Fighting island; soft bottom; deep water close-to. Mama- juda light-house, N. 4 W., 14 miles. MAMAJUDA LIGHT-STATION.--A fixed red light, 4th order, visible 12 miles. White dwelling with low, square tower, . on top; pile foundation. Light 32 feet abovefoundation. Station * connected with fishing-station, on north side, by a short foot- bridge. On Mamajuda shoal, west side of channel; 200 feet from