TROON, SCOTLAND. —The schooner Mistletoe, of Brixham, bound from Saffi, N. Africa, for Irvine, with a cargo of beans, went ashore on Lady Island, on the night of the 6th September. On the following day a strong gale sprung up from the S.W., with a very heavy sea, and at about 1 P.M. the schooner hoisted signals for the Life-boat, there being upwards of twenty men on board the vessel, in addition to.