John Locke (1632-1704) is perhaps the greatest philosopher in the English language. A political activist in a revolutionary age, Locke's prolific correspondence opens up the cultural, social, intellectual, and political worlds of the later Stuart era. Spanning half a century, the letters trace the transition from Puritanism to the Enlightenment. A man of insatiable curiosity, Locke's letters encompass science (his correspondents include Isaac Newton and Robert Boyle), education, travel, religion, and the birth of the British empire.