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30 THOMPSON'S COAST PILOT. Island, just beyond the low point which makes out from Rock Island to the SW. From Rock Island Lighthouse, run for Buoyer's Bluff, 7 miles. This Bluff is also very bold, and can be approached within ¢ of amile. Thence shape your course SWew, for the westermost point of Chamber's Island, 26 miles; thence SbyWW 11 miles, so as to pass ¢ of a mile to the eastward of Green Island, and continue the same course 9 miles farther-- 20 miles in all from Chamber's Island, to pass the point of Per- shetico Shoal, which sets off 34 miles to the SE trom Pershetico Point; when past the shoal or abreast of Pershetico Point, steer SWbyS 81 miles to the buoy off Long Tail Point Lighthouse; leaving this buoy (red) to starboard; Point aux Sauble Bank buoy (black) to port; Grassy Point buoy (red) to starboard. All the rest of the buoys are red, and must be left on the star- board hand. Give them a berth of 40 feet. The greatest depth of water carried out in 1867 was 11 feet on the level. In the middle of the channel the bottom is hard, until after passing Grassy Point, when it is hard, covered with mud. Outside of Grassy Point, it is sandy out of the channel; within Grassy Point, there is mud bottom out of the channel. The depth of | water is affected to the extent of from 6 to 18 inches by the wind and varying atmospheric pressure; the changes being of almost daily occurrence. _' The courses are magnetic; and due allowance should always be made for set of current in the bay, and also among the islands, according to which way the wind is or has been blowing. Fishing Island Shoal lies ESE from the east side of Rock Island about 2 miles, and is just above water. A few years ago there was a fishing shanty on this island, but the rise of water drove it off. The water is deep all round it, and there is good anchorage under the SH side of Rock Island, in 5 to 9 tathoms water. There is also another reef which lies SSH, 8 miles from the SE end of Rock Island, $ a mile long, with 4 feet water on it. FROM WASHINGTON HARBOR TO 'LONG TAIL POINT LIGHTHOUSE, BY THE STRAWBERRY ISLAND CHANNEL. Run out of the harbor close round Buoyer's Bluff, which is very bold, and at a distance of 2 of a_mile; steer SWbyS 29 miles