Notes: [1] Descartes’s collected works were printed in many editions throughout the latter half of the seventeenth century, with varied and unpredictable arrangements of individual texts contained in each copy. The bulk of this book is a 1656 third edition of Descartes’s Opera philosophica printed by Daniel and Louis Elvezir. Its complete contents are: Meditationes de prima philosophica (1670) by Daniel Elvezir, Principia philosophiae (1656), Dissertatio de methodo with Dioptrice and Meteora (1656), Tractatus de passionibus anime (1656) by Daniel and Louis Elvezir, and Tractatus de homine (1686) by Joan Blaeu. [2] Handwritten note on the title page of Meditationes reads, “Hieronymous Fränkel Dessauiensis 1827.” This is likely F. Hieronymous Fränkel, a physician who practiced in Dessau, Germany, in the nineteenth century. [3] Jonas Cohn was an early twentieth-century German-Jewish philosopher. His bookplate appears on the front pastedown. It includes Cohn’s name and a line from Goethe’s “Vermächtnis,” reading, “Das alte wahre, fass es an.” [4] Cohn fled to England during World War II and eventually settled in Birmingham, where the now-defunct Selly Oak Colleges was located. A bookplate on the front flyleaf indicates the book was presented to Selly Oak Colleges Library by Jonas Cohn. [5] Written records from Ted Steinbock indicate the purchase of collected volumes of Descartes’s works in 1985, 1987, and 1991—the former two from Rootenberg Rare Books & Manuscripts in Los Angeles, California, and the latter from an unidentified seller. Further research is necessary to confirm the exact purchase date and seller.