Some turned their attention to obtaining information for the general good, upon all that related to travelling in frozen regions; others plodded through many a volume, for meteorological information upon which to arrange a safe period of departure for the travellers in the spring; others tried to found some reasonable theory as to the geography of the unexplored regions around us; whilst a portion more actively employed themselves in bringing into action divers practical means of communicating with our missing country-men which had been supplied to us in England. Rockets, in the calm evenings of early winter, were fired with great effect; in proof of which, signals were several times exchanged, both in the autumn and spring, between Assistance Harbour and our squadron, by the aid of these useful projectiles, although the distance was twenty miles. [Headnote: _ROCKETS.--BALLOONS._] The balloons, however, as a more novel attempt for distant signalizing, or, rather, intercommunication, were a subject of deep interest. The plan was simple, and ingenious; the merit of the idea, as applicable to the relief of Sir John Franklin, by communicating to him intelligence of the position of the searching parties, being due to Mr. Shepperd, C.E. It was as follows: a balloon of oiled silk, capable of raising about a pound weight when inflated, was filled with hydrogen evolved from a strong cask, fitted with a valve, in which, when required for the purpose, a certain quantity of zinc filings and sulphuric acid had been introduced. To the base of the balloon, when inflated, a piece of slow match, five feet long, was attached, its lower end being lighted. Along this match, at certain intervals, pieces of coloured paper and silk were secured with thread, and on them the information as to our position and intended lines of search were printed. The balloon, when liberated, sailed rapidly along, rising withal, and, as the match burnt, the papers were gradually detached, and, falling, spread themselves on the snow, where their glaring colours would soon attract notice, should they happily fall near the poor fellows in the "Erebus" and "Terror." Every care was taken to despatch these balloons with winds from the southward and south-east, so that the papers might be distributed to the north and north-west, and westward. Fire-balloons, of which there were a few, were likewise despatched; but the impression in my own mind is, that the majority of the balloons despatched by us, after rising to some height, were carried by counter-currents--always the most prevalent ones at the cold season of the year--to the southward and south-west. On two occasions I distinctly saw the balloons, when started with S.E. winds, pass for a while to the N.W., and then, at a great altitude, alter their course under the influence of a contrary current, and pass as rapidly to the S.E., in the teeth of the light airs we had on the floe.