Greenlanders call the Narwal the forerunner of the whale; for wherever it is seen, the whale is shortly after sure to follow. This may arise as well from the natural passion for society in these animals, as from both living upon the same food. These powerful fishes make war upon no other living creature; and, though furnished with instruments to spread general destruction, are as innocent and as peaceful as a drove of oxen. The Narwal is much swifter than the whale, and would never be taken by the fishermen but for those very tusks, which at first appear to be its principal defence. These animals are always seen in herds of several at a time; and whenever they are attacked they crowd together in such a manner, that they are mutually embarrassed by their tusks. By these they are often locked together, and are prevented from sinking to the bottom. It seldom happens, therefore, but the fishermen make sure of one or two of the hindmost, which very well reward their trouble. LOSS OF THE BRIG TYRREL. In addition to the many dreadful shipwrecks already narrated, the following, which is a circumstantial account given by T. Purnell, chief mate of the brig Tyrrel, Arthur Cochlan, commander, and the only person among the whole crew who had the good fortune to escape, claims our particular attention. On Saturday, June 29th, 1759, they sailed from New York to Sandy Hook, and there came to an anchor, waiting for the captain's coming down with a new boat, and some other articles. Accordingly he came on board early the succeeding morning, and the boat cleared, hoisted in, stowed and lashed. At eight o'clock, A. M. they weighed anchor, sailed out of Sandy Hook, and the same day at noon, took their departure from the High Land Never Sunk, and proceeded on their passage to Antigua. As soon as they made sail, the captain ordered the boat to be cast loose, in order that she might be painted, with the oars, rudder and tiller, which job, he (Captain Cochlan) undertook to do himself. At four P. M. they found the vessel made a little more water, than usual; but as it did not cause much additional labour at the pump, nothing was thought of it. At eight, the leak did not seem to increase. At twelve it began to blow very hard in squalls, which caused the vessel to lie down very much, whereby it was apprehended she wanted more ballast. Thereupon the captain came on deck, being the starboard watch, and close reefed both top-sails. At four A. M. the weather moderated--let out both reefs:--at eight it became still more moderate, and they made more sail, and set top-gallant-sails; the weather was still thick and hazy. There was no further observation taken at present, except that the vessel made more water. The captain was now chiefly employed in painting the boat, oars, rudder and tiller.