4th » The crewless United States American ship ship Mary Celeste is found by the United Kingdom British brig 'Dei Gratia'. The ship had been abandoned for nine days but was only slightly damaged.
9th » In Louisiana, P. B. S. Pinchback becomes the first serving African-American governor of a U.S. state.
21st » Challenger expedition: HMS Challenger 1858 6, commanded by Captain George Nares, sails from Portsmouth Portsmouth, England.