Last Night arrived the Mercury, of Nantucket, for London, taken the 25th of July [sic June] by the Cerberus, Captain Symonds [John Symons] , off Block Island, from her Return on a Whale Voyage; she has also on board a Cargo of a Schooner which had been also a Whaling, which the Cerberus burnt: The Master of the Prize is Henry Spencer, who says the Cerberus has taken sixteen Prizes;