But I soon discovered that, even now, with the boat under canvas, to beat back to the ship was an impossibility; for the boat had not been built for sailing to windward in a strong breeze; she was the ordinary type of ship's longboat, constructed to carry a heavy load in proportion to her dimensions, with a long, flat floor, bluff bows, and with only some three inches of exposed keel; and while she might possibly, with skilful management, have been made to work to windward in very moderate weather, she now, with so strong a wind and so heavy a sea to battle with, drove to leeward almost as rapidly as she forged ahead.  Nor did I dare to press her with any more canvas, for she was already showing more than was at all prudent, the stronger puffs careening her to her gunwale and taxing my seamanship to the utmost to prevent her from filling. Under such circumstances, with the boat demanding my utmost vigilance to keep her afloat, it will be readily understood that I was only able at intervals to cast a momentary glance toward the ship to see how she was faring, and even then it was not always possible for me to catch a glimpse of her because of the mountainous seas that interposed themselves between her and me.  At length, however, when I had been adrift about half an hour, I got a chance to take a fairly long look to windward at a moment when the longboat was hove up on the crest of an unusually lofty wave; but the ship was nowhere to be seen; nor did I again catch sight of her, or even of the raft; and the only conclusion at which I could arrive was that she had gone down and taken all hands with her.