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THOMPSON'S COAST PILOT, 39 run through, open the passage and steer about NiW, keeping the east side best aboard. 'The west side, at the entrance, is rocky, -- and composed of magnetic reefs. To clear the rocks on the east side before entering the channel, keep the NE point of Cockburn Island open with the SW point of the Great Manitoulin Island, and when through, haul up NWbyW 22 miles, for Sulphur Island. The False Detour Passage is deep, but not quite so straight as the Mississauga Channel. To run through, keep midway, in 54 to 120 feet water. Rocky on both sides. After getting well into the channel, the course is about NNE; when through, steer NW for Sulphur Island 14 miles. SAGINAW BAY AND THE HIGH LANDS OF SAUBLE. FROM POINT AUX BARQUES TO SAGINAW RIVER, SIXTY MILES » AS FOLLOWS: . From Point aux Barques to Charity Islands NW4W.8 miles ; thence W48 22 miles; thence SWhyS 33 miles, or until the Lighthouse at the entrance to Saginaw River bears S2W (mag- netic ;) you will then be in 12 to 14 feet water; run on this range until the first buoy is made close aboard on the larboard hand; then haul up S2H (magnetic,) keeping the buoys (black) on the larboard hand until all are passed, when you are in the river. Should the buoys not be visible, as is sometimes the case, being carried away or moved, then run for the Lighthouse, on the bear- ing S2Ww (magnetic,) until Frazer's Dock (the first one on the starboard hand in the river, and plainly seen from the bar,) bears §8E (magnetic ;) then haul up and run for the dock until the lead indicates you are over the bar and in the river. Variation of compass in this vicinity, 1°27'44" E, 'With the wind from the NE the water rises from 7 to 15 inches, and from the south and SW the water lowers from 2 to 8 inches from a common level. FROM SAGINAW RIVER TO THUNDER BAY ISLAND LIGHTHOUSE. From Frazer's Dock run out N2W (magnetic, ) leaving all the black buoys on the starboard hand; and when clear of the outer