These considerations, of very serious import, were settled, happily, by another sign which the watchful navigator got sight of. He discerned, for short intervals, occasionally, a very slight motion, as he conceived, of the water in contact with some of the large lumps of ice near the ship. His careful scrutiny of the masses, under an anxiously watchful eye, at length assured him that there _was_ a movement. Experience then certified that the movement could only arise from a _swell_, and that the swell must proceed either from the main ocean, southward, or else from some immense interglacial lake, or what is technically called “a sea of water,” northward. That it _did not_ come from the southern ocean, the distance to which he had penetrated, and the unmixed brightness of the ice-blink in each of the southern quarters, convinced him; and that it _did_ come from the northward he was able to satisfy himself, by carefully observing the points or places on the masses of ice where the alteration of level in the water was the greatest; for this scrutiny sufficed to show, that the axial position of the ice, which the motion pointed out, was in strict parallelism with a wave coming directly from the place of the “water-sky” to the northward. Encouraged by these indications, he determined on leaving a position recently attained, where the ship had some little room, and pushing, at all risks, into the formidable body of consolidated ices still beyond him. This arduous and adventurous purpose was commenced on the 13th of May, with a moderate breeze (favourable to our advance) from the south-west. Little progress was, indeed, then made; but laborious perseverance, rendered effective by a consummate application of all the means and resources available for our furtherance, ultimately yielded the desired, and I might add, deserved success. During five successive days, a series of labours were carried on of the most energetic and persevering description. The transit through the intervening ice,—which consisted, as we have intimated, of extensive sheets of bay-ice, with heavy lumps and masses consolidated therein,—was urged by all the variety of aids that were known to be applicable. These aids, beyond the available force of occasional favourable winds, consisted in the cutting of tracks or channels with ice-saws, where the thickness was too great to be broken, or, where thinner, in breaking the ice under the bows by boats suspended beneath the bowsprit, whilst their crews rolled them violently, from side to side, as in “sallying;” in making canals, by well-laden boats being run across extensive planes of ice, where their weight, with that of their crews, might be sufficient to break the resisting surface; in “warping” through encumbered channels, or amid lumps of more ponderous ices; in “towing” with boats, or “tracking” by men on the ice, during calms, along any clear channels of water which might have been opened out a-head; and, finally, by