Duff, Alexander, an eminent Indian missionary, born at Moulin, near Pitlochry, Perthshire; a man of Celtic blood, apostolic zeal, and fervid eloquence; was the first missionary sent out to India by the Church of Scotland; sailed in 1830, returned in 1840, in 1849, and finally in 1863, stirring up each time the missionary spirit in the Church; he was the originator of a new method of missionary operations in the East by the introduction of English as the vehicle of instruction in the Christian faith, which met at first with much opposition, but was finally crowned with conspicuous success; died in Edinburgh (1806‒1873).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Dudley, John * Duff, James Grant