If the sufficiency claim, and with it the reciprocity thesis, is denied, we need an alternative account of how §17 functions in the overall argument of the B-Deduction. It may be that the role of this section is largely to provide a characterization of an object that has a key role in the ensuing challenge to Humean associationism, and thereby initiates an argument from below. Kant’s proposal is that an object is “that in the concept of which a manifold of a given intuition is united” (B137). Th