Professor Henry Drummond (1851-1897) was a Scottish evangelical writer and lecturer. He was educated at Edinburgh University, where he displayed a strong inclination for physical and mathematical science. While preparing for the ministry, he became for a time deeply interested in the evangelizing mission of Moody and Sankey, in which he actively co-operated for two years. In 1877 he became lecturer on natural science in the Free Church College, which enabled him to combine all the pursuits for which he felt a vocation. In 1888 he published Tropical Africa, a valuable digest of information. In 1890 he travelled in Australia, and in 1893 delivered the Lowell Lectures at Boston. His works include: Natural Law in the Spiritual World (1883), The Greatest Thing in the World and Other Addresses (1891), Pax Vobiscum (1891), The Changed Life (1891) and The Lowell Lectures on the Ascent of Man (1894).