 The translations, with minor variations, are from Descartes 1979, 1983, 1984a, 1984b, 1991, but the passages are identified with respect to the Adam and Tannery edition of the Oeuvres de Descartes (1976) according to the standard convention: “AT”, followed by volume and page number. Passages cited from the Principles, however, will be identified by “Pr”, followed by volume and article, and with a final “F” indicating the inclusion of new material from the French translation of 1647.