  Voetius, with the support of his professorial colleagues in theology, replied to Regius by appending corollaries to his own theological disputations, in December 1641, in which he accused proponents of the ‘new philosophy’ [i.e., Cartesianism] of a number of errors: teaching that a human being is an accidental being, defending Copernicanism, and supporting scepticism and irreligion by denying substantial forms. In the course of these replies to Regius, Descartes’ name was also mentioned, and it was clear that Regius and Descartes were perceived by Voetius as jointly attempting to undermine the philosophical foundations of Calvinist theology as taught at Utrecht. Initially, Descartes joined the debate merely by advising Regius how to respond appropriately to Voetius. One part of that advice was that Regius should have dealt with substantial forms as Descartes had done in the Météores (AT VI, 239): that he should not have rejected them explicitly but, instead, should merely have omitted them as redundant to genuine explanations.