A Scotsman who was converted in 1811 under Gideon Ouseley while serving in the army in Ireland. He went as a missionary to Jamaica in 1817 and served in the West Indies for 35 years. He was believed to have been the secretary of a group of missionaries which in 1824 drafted compromising resolutions on slavery in response to charges and threats by white settlers. In Britain the resolutions were repudiated by the WMMS as contrary to the 'no politics' rule. Horne protested that he had not been present at the meeting and resisted his transfer to Bermuda. He died in Bermuda on 10 July 1856.