Abstract

Mendelssohn's disagreement with Kant's definition survived on a two-sided Folio sheet (Statsbibliothek zu Berlin, Preuss. Kulturbesitz:, Nachlass 162, D I.4.). The dispute relates to Kant's inaugural lecture in Königsberg (August 1770): "De mundi sensibilis atque intelligibilis forma et principiis". A copy was immediately delivered to Mendelssohn by Kant's and Mendelssohn's mutual disciple, Marcus Herz. From Herz's long letter-report we know of a four-hour long discussion concerning Mendelssohn's intention to contrast Kant's definition of 'Raum' and 'Zeit' with that by Leibniz. Apparently Mendelssohn's objection was never concluded or in print, hence, the _Kritik der reinen Vernunft (1781) still retains the interpretation that Mendelssohn's contested in 1770