Renati Descartes Epistolæ partim ab auctore latino sermone conscriptæ, partim ex gallico translatæ, etc. (pt. 3. Epistolæ ... in quibus respondet ad plures difficultates ipsi propositas in dioptrica, geometria, variisque aliarum scientiarum subjectis.) [Based on tom. 1-3 of Clerselier's collection.]
