IRVINE, N.B.—On the 20th December, at about 2 P.M., the tug Irvine, of Irvine, was proceeding to Ayr to tow a vessel to Irvine Harbour, during a strong S.W. gale and a heavy sea. She grounded on the centre of the bar, and showed signals of distress, in response to which the Isabella Frew Life-boat promptly went to her, and brought ashore her crew of four men..