方法序説
Descartes continued to publish works concerning both mathematics and philosophy for the rest of his life. In 1641, he published a metaphysics treatise, "Meditationes de Prima Philosophia" ("Meditations on First Philosophy"), written in Latin and thus addressed to the learned. It was followed in 1644 by "Principia Philosophiae" ("Principles of Philosophy"), a kind of synthesis of the "Discourse on the Method" and "Meditations on First Philosophy". In 1643, Cartesian philosophy was condemned at the University of Utrecht, and Descartes was obliged to flee to the Hague, settling in Egmond-Binnen.