San Fhancisco, Sept. 18. -The mystery surroundhig the schooner Pannonia, so long1 overtluo at this port from the Marshall islamls, is at last clcarcd up. The vessel sailed for San Francisco on May 1, ladeo u-ith a general cargo, and in addition to u crew of seven had on board Capt. Lovedale's wife and three children. It is also stated that several missionaries had taken passagv on the Pannonia to come to this city. The schooner was wrecked on a reef to the northwest of the Hawaiia islands nnd every soul on board was drowned.