8vo (approx. 17 cm). Contemporary boards, later institutional cloth covering, with printed spine reference.
Scarce true first edition, first issue of Jacobi’s most influential philosophical work, presenting his correspondence with Moses Mendelssohn and precipitating the so-called Pantheismusstreit—one of the defining intellectual controversies of the late Enlightenment.
Provenance: From the collection of Julius Rosenthal (1827–1905), prominent German-born lawyer and philanthropist in Chicago. Front pastedown with University of Chicago Library gift bookplate (“Gift of Julius Rosenthal,” stamped withdrawn); title page stamped and punched by the University Library, with additional withdrawal markings; rear pastedown with Swift Hall Library wallet. Accession records (no. 208247, January 11, 1905) confirm the donation as part of a group of volumes for the German departmental library. Later transferred to the Divinity School and subsequently withdrawn, likely as a duplicate. Acquired by the present owner from the collection of Tim Lutz.
Condition: Very Good or better. Boards lightly worn at extremities; corners gently bumped. Text internally bright, clean, and remarkably well preserved, with strong legibility throughout. Institutional markings as described below. A crisp and appealing example of this scarce first issue.