  With this general background on our two great principles in place, together with how these principles operate in Wolff (sometimes in contrast with how they operate in Leibniz),  we now turn to a consideration of how these principles operate in Du Châtelet's opening chapter of the Foundations. While we cannot here do full justice to Du Châtelet's account of the first principles of knowledge, we  provide some essential background to these principles in order to set the stage for an evaluation of other central aspects of her natural philosophy as presented in the Foundations.