 Today, Sturm is most commonly remembered as the polemical target of Leibniz’s essay De Ipsa Natura (1698), which is part of an articulated controversy between Sturm and Leibniz on whether nature can be considered endowed with active principles (a claim denied by Sturm and defended by Leibniz). In fact, Leibniz and Sturm knew of one another, since they were both students of Erhard Weigel (Lemanski 2018). Presumably, they met in the 1660s, maybe when Leibniz was at Altdorf University in 1666 or when he was the secretary of the alchemical society in Nuremberg in 1667 (for Leibniz life, see Arthur 2014: x–xvi).