On Tuesday the 29th past arrived at Marstrand [Sweden], a free Port in the neighbourhood of Gottenburgh; a brig of about 160 tons burthen, called the Molly, ——, Master, from Philadelphia, laden with rice, and indigo, to a person formerly of Scotland, but now of Gottenburg, which Gentleman dispatched for the Congress last January, from Marstrand, a cargo of gunpowder and other implements of war; and he is now busy in purchasing such another cargo to go by the Molly, who brings advice of five more American vessels that were soon to proceed to the said Merchant. It is generally believed that the Captain, as soon as he is clear at Marstrand, will go a privateering.