 It is difficult to understand the implications of Kant’s discussion of mechanism and teleology without knowing what he means by “mechanism”, and unfortunately this is very hard to determine from the text. Many commentators have taken the notion of mechanism to be equivalent to the notion of causality in time which figures in the Critique of Pure Reason, so that the principle of mechanism is equivalent to the causal principle which Kant takes himself to have proved in the Second Analogy. If the notion of mechanism is understood in this way, then Kant’s solution to the antinomy of teleological judgment is radically at odds with his views in the Critique of Pure Reason, since it involves the claim that the principle of mechanism is merely regulative as opposed to constitutive. McLaughlin (1989, 1990), and following him Allison (1992), reject this reading, instead taking the notion of mechanism in the relevant sense to correspond to a more specific type of causality, namely the causality by which the parts of a thing determine the whole rather than the whole’s determining the parts; this view is also taken by Zanetti (1993). Ginsborg (2001) offers a third proposal, on which a thing can be explained “mechanically” if its existence can be accounted for in terms of the intrinsic powers of the matter out of which it comes to be. The topic of mechanism in the context of the Critique of Judgment is discussed further in Breitenbach (2008) and Geiger (2017).