Off the south western corner of Yezo, and about ninety miles from Hakodadi, lies the small island of O'Kosiri, in the track of vessels going north. By morning we had reached its neighbourhood--it could be seen in fact--when suddenly a thick fog enveloped it, us, and the surrounding sea. We were to have gone outside the island, though the inner passage is navigable, still, to avoid any possibility of an accident, it was deemed best to go to seaward of it. At 4 a.m., whilst steaming at six knots, the look out man reported land dead ahead. The officer of the watch, seemingly pretty confident as to his whereabouts, altered course a point or so, and kept on at the same speed. An hour passed, the fog had settled thicker than ever. At ten minutes past two bells in the morning, without any warning--the lead even shewing deep soundings--a crashing, grating sound was heard, accompanied by a distinct trembling vibration, proceeding, apparently, from under the ship's bottom. Even then, no one dreamed we were ashore; such a sound, such a sensation, might have been produced by running over a junk. At this moment the leadsman got a throw of the lead, and "_a quarter less four_," indicated only too plainly the origin of the sounds. With his usual promptness--as if running ashore was a matter of ordinary evolution--our captain at once gave orders for engines to be reversed, for boats to be hoisted out, and anchors placed away, where they would be of most use; at the same time directions were given to have the steam launch coaled and provisioned to go back to Hakodadi for assistance. On soundings being taken along the starboard side plenty of water was obtained; it was only on her port bottom that the ship had grounded. Efforts were made to roll her off, all hands rushing from one side of the deck to the other, but without result. Through the crystal clear water, and in the deep shadow of the ship, the nature of the bottom could be clearly seen--coral rocks and yellow sand. Fortunately the sea was a flat calm, or it must have fared ill indeed with us. At ordinary times the sailor prefers plenty of sea room, and the further he is from land the safer he feels; but when one's ship has suddenly converted "_mare_" into "_terram_" with, may be, a hole in her to boot, then indeed the proximity to some friendly shore is his first consideration. The lifting fog revealed to us our whereabouts; within a hundred yards of us the surf washed edges of a reef, and before us the low shores and high hills of O'Kosiri. The unusual sight of a large ship so near their island soon brought the natives off in their queer canoes. By means of our interpreter we learn that the people had never seen a man-of-war before; that there was no rise and fall of tide there; and much more about the ways and means available for opening up communications with Hakodadi.