  In essence, what Du Châtelet disputes in Keill's universalization of Newton's theory of attraction is his use of it to explain, among other phenomena, the cohesion of bodies and their spring, or elasticity. To make these claims, which focus specifically on features intrinsic to bodies rather than on relational features that bodies bear, Du Châtelet believes these thinkers must claim that attraction is a property of matter itself (IP  §389–92).[30] Her mention in this passage of his “forced” hypotheses alerts us to the fact that she believes Keill is using hypotheses in forwarding this claim about matter. As the previous section showed, she can have no quibble with the fact that he uses hypotheses, yet she clearly dissents from his hypotheses with respect to the nature of matter and the phenomena he wishes to explain through this matter theory.