Scottish physician, born in Aberdeenshire in 1671; died at Bath in 1743. In 1700, after taking the degree of M.D., he repaired to London, where he practiced in winter, and in Bath in summer. In 1702 he published A New Theory of Fevers and a work On Fluxions which procured him admission into the Royal Society. Among his other works are Philosophical Principles of Natural Religion; Essay on Health and Long Life; etc.