SAILING-ICE.--Ice of which the masses are so much separated as to allow a ship to sail among them. SALLYING a Ship.--The operation of causing her to roll, by the men running in a body from side to side, so as to relieve her from the adhesion and friction of the young ice around her. SLUDGE.--Ice of the consistence of thick honey, offering little impediment to a ship while in this state, but greatly favouring the formation of a "bay-floe." STREAM.--A long and narrow, but generally continuous, collection of loose ice. TONGUE.--A mass of ice projecting under water from an iceberg or floe, and generally distinguishable at a considerable depth of smooth water. It differs from a "calf" in being fixed to, or a part of the larger body. WATER-SKY.--A dark appearance in the sky, indicating "clear water" in that direction, and forming a striking contrast with the "blink" over land or ice. YOUNG-ICE.--Nearly the same as "bay-ice," but generally applied to ice more recently formed than the latter. VOYAGE FOR THE DISCOVERY OF A NORTHWEST PASSAGE INTRODUCTION. Lieutenant Parry was appointed to the command of his majesty's ship the Hecla, a bomb of 375 tons, on the 16th of January, 1819; and the Griper, gun brig, 180 tons, commissioned by Lieutenant Matthew Liddon, was at the same time directed to put herself under his orders. The object of the expedition was to attempt the discovery of a Northwest Passage into the Pacific. The vessels were rigged after the manner of a bark, as being the most convenient among the ice, and requiring the smallest number of men to work them. They were furnished with provisions and stores for two years; in addition to which, there was a large supply of fresh meats and soups preserved in tin cases, essence of malt and hops, essence of spruce, and other extra stores, adapted to cold climates and a long voyage. The ships were ballasted entirely with coals; an abundance of warm clothing was allowed, a wolfskin blanket being supplied to each officer and man, besides a housing-cloth, similar to that with which wagons are usually covered, to make a sort of tent on board. Although the finding a passage from the Atlantic to the Pacific was the main object of the expedition, yet the ascertaining many points of natural history, geography, &c., was considered a most important object, never to be lost sight of. After they had passed the latitude of 65° north, they were from time to time to throw overboard a bottle, closely sealed, containing a paper, stating the date and position at which it was launched. Whenever they landed on the northern coast of North America, they were to erect a pole, having a flag, and bury a bottle at the foot of it, containing an abstract of their proceedings and future intentions, for the information of Lieutenant Franklin, who had been sent on a land expedition to explore that coast from the mouth of the Coppermine River of Hearne.