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LAKE 8ST. CLAIR. z 93 Windmill Point to Mouth of the Thames River.-- When i mile south of light, steer E. by N., 34 miles ; thence E. # S., 204 miles, to a point 13 miles N. W. $ N. from main light, and in range with the beacon. Heavy draught vessels should pass on the north side of the light-ship, then E. $S., 20 miles, to a point 12 miles N. W. 4 N. from main light, as above. Windmill Point to Clinton River.-- When 3 of a mile east of the light, steer N. E. 4 N., 2 miles, to abreast of Club-House dock, then N.N. E. 4 E., 144 miles, to a point 14 miles east of Point Huron, and note that a range line from the upper canal light and the St. Clair Flats beacon-light crosses the south end of the spit to the south and eastward of Point Huron in 6 feet of water; thence N. 4 W., 2 miles, to a point 3 of a mile east of the old light-house, when follow the buoys in, passing south of and close to a crib, north of the dredged channel. Windmill Point to New Baltimore.-- When 13 miles east of Point Huron, as in the course to Clinton river, steer N. by E., 8 miles, to the dock at New Baltimore. : Mouth of the Thames River to St. Clair Flats Ship Canal.-- When 13 miles N. W. 3 N. from main light, and in range of the two lights, steer N. W. 4 N., 16 miles, to a point 1 mile south of light on the lower end of west pier, when haul up gradually until the lights are in range. ! 7 7 Mouth of Thames River to Mouth of Clinton. River.-- When 13 miles N. W. 3 N., from the main light, and in range of the two lights, steer N. W., 21 miles, heading on Point Huron, to within 14 miles of it, when steer N.. 34 miles, to a point $ miles east of the old light- house; when see course from Windmill point to Clinton river. SY. Chir Flais OD Gas To Enter the St. Clair River through the old cut.--From the light-ship, steer N. E. 2 N., 12§ miles, or until in range of the lights, and 14 miles from the beacon, when haul up on the range, bearing N. E. by E., which course will lead through the center of the channel, the north- west side of entrance to which is marked by black buoy No.1. Keep the light and beacon in range, following the buoys until near the beacon, when haul gradually to E. 8. E., bringing the stern of the vessel on the beacon, and steering a little to the southward of the upper canal-light, or keeping the light a little open on the port bow. When midway between the two black buoys, Nos. 3 and 5, haul gradually to the northward for the middle of south channel of St. Clair river. The old cut and channel through the St. Clair flats, from Lake St. Clair to abreast the upper light of the ship-canal, is about 25 miles in length, and from 50 to 60 yards wide in its narrowest part ; it is now used only by small craft under sail and tugs towing rafts. St. Clair Flats Beacon-light.--A fixed white light, 6th order, visible 11 miles. Yellow brick tower, 23 feet high. On a crib, 1,000 feet S. W. by W. from main light. This beacon, with the main light, forms the range for the old cut. St. Clair Flats Canal lower light, S. by E. 4 E., 18 miles. ST. CLAIR FLATS LIGHT-STATION.--A fixed white light, 4th order, visible 13 miles. Yellow brick tower, 37 feet high, con-