In the autumn of 1730, a professor began to lecture at the University of Glasgow in a language his students could understand without translation. This was not, on its face, a revolution. The man was thirty-six years old, Irish by birth, the son of a Presbyterian minister in County Down, and he had spent the previous decade running a dissenting academy in Dublin because his connections had made a Scottish pulpit difficult to obtain. He had been elected to the Chair of Moral