Originally published in 1987, this important synthesis represented the first effort by modern scholars to convey the variety of ways in which medieval scientists and natural philosophers used mathematics and mathematical modes of thought to describe natural phenomena. Eleven distinguished historians of science contributed original essays on the application of mathematics to natural philosophy, astronomy, cosmology, optics and medicine. The book is a fitting tribute to Professor Marshall Clagett of The Institute for Advanced Study, Princeton, for his significant contributions to the history of medieval science.