Like Kant's Critique of Pure Reason, we now have both an A- and a substantially revised B-edition of Henry Allison's commentary to and defence of that work: Kant's Transcendental Idealism: An Interpretation and Defense . Unlike Kant's Critique, however, Allison's first edition is unlikely to persist as an occasional rival to the second, since reviewers rightly consider the second to have superseded the landmark scholarship of the first. Nevertheless, before Allison's first edition is entirely supplanted, I would like to save (...) a neglected insight from its treatment of the B-deduction that is not retained in the second edition. (shrink)