  The significant—and positive—impact upon her text on natural philosophy followed from the fact that Koenig brought with him to France, and to Du Châtelet, the Leibnizian-inspired ideas of Christian Wolff. This may have contributed to a critical change in Du Châtelet's project, for Newtonian physics alone no longer seemed to her to be the correct way of explaining various features of the natural world. Still, it is quite possible that Koenig's influence on Du Châtelet has been over-estimated, for when Du Châtelet's earliest version of the Institutions de physique (hereafter Foundations) was approved by the censor Pitot—before Du Châtelet's tutoring sessions with Koenig—Pitot mentioned that the text already contained ideas from  Leibniz.[1]  Nonetheless, in her later, published version of the Foundations, it is possible that she came to see more forcefully the need for metaphysical foundations for the phenomena that Newton so powerfully describes in mathematical terms (e.g. Janik 1982, 93 and 102). And so, in 1738, Du Châtelet withdrew her Foundations from imminent publication in order to massively redraft it. The final product, published in 1740, would include an Introduction followed by ten chapters on topics of metaphysics touching on issues such as the principles of knowledge (chapter 1), God (2), space and time (5 and 6) and four chapters on matter and bodies (7 through 10). Only then does the text deal with physics of an essentially Newtonian character.