The English physician Thomas Sydenham (1624-1689) emphasized, in practicing medicine, careful observation and experience and earned the title "English Hippocrates."

Born in Winford Eagle, Dorset, the fifth son of a wealthy country gentleman, Thomas Sydenham entered Magdalen College, Oxford, in 1642. His studies were interrupted by the outbreak of the civil war, during which the Sydenhams fought for the parliamentarians. He returned to Oxford in 1647, receiving his bachelor degree the following year. In 1651 he rejoined the army, after which he stayed at Oxford until 1663, when he was married and opened his London practice.

With only 18 months of formal medical education, consisting of a mixture of classics, anatomical dissections, and formal disputations, Sydenham found little use in theoretical learning, and experimental science seemed just as useless to him. He was convinced that only the careful observation of diseases at the bedside could lead to medical progress, and he spent all...