The document presented below stems from the Jean Hering Nachlass in the Médiathèque protestante of Strasbourg and was originally preserved in the Archive of the Collegium Wilhelmitanum Argentinense (the Protestant Institute) of the same city. It concerns a typescript of 7 folios, which was unknown up until now, dealing with the idealism-realism controversy and presenting original views on the consequences of this controversy regarding the issue of metaphysics.