 Together with Hume’s emphasis on accounting for the phenomena in his interpretation of Newtonian philosophy, Hume is far removed from Newton’s realist ontology of interacting forces (Janiak 2007; Smeenk &amp; Schliesser 2013). Two further sources for this difference are revealed when we analyze Hume’s departure from Newton’s account of causation  (§4.4)  and Newton’s rules of reasoning  (§4.5).