Scientific Thought

John Dee: The World of an Elizabethan Magus.By Peter J. French. Pp. x + 243. (Routledge and Kegan Paul: London, February 1972.) £3.75.Samuel Johnson and the New Science.By Richard B. Schwartz. Pp. x + 188. (University of Wisconsin: Madison, Milwaukee and London, June 1971.) £4.75.