Note on references and abbreviations: References to Descartes' works as found herein use the pagination of the Adam and Tannery volumes (AT), Oeuvres de Descartes, 11 vols. The citations give volume and page numbers only (dropping the abbreviation “AT”). Where possible, the Cottingham, Stoothoff, Murdoch, and Kenny translation, The Philosophical Writings of Descartes, 3 vols., has been used; it shows the AT pagination in the margins. Where the translation has been emended, the citation is marked with an asterisk (*). The AT volume numbers provide a guide to which work is being cited in translation: vols. 1–5, correspondence; vol. 6, Discourse and essays (including the Dioptrics and Meteorology); vol. 7, Meditations; vol. 10, Rules; vol. 11:1–118, World, or Treatise on Light; vol. 11:119–222, Treatise on Man; vol. 11:301–488, Passions. Where there is no accessible translation for a citation from AT, the citation is shown in italics. Works that are broken into parts and/or articles are cited by abbreviated title, part, and article: Med. for the Meditations, Met. for the Meteorology, Princ. for the Principles, and Pass. for the Passions.