Wittgenstein gives voice to an aspiration that is central to his later philosophy, well before he becomes later Wittgenstein, when he writes in §4.112 of the Tractatus that philosophy is not a matter of putting forward a doctrine or a theory, but consists rather in the practice of an activity-an activity he goes on to characterize as one of elucidation or clarification-an activity which he says does not result in philosophische Sätze, in propositions of philosophy, but rather in das Klarwerden von Sätzen, in our attaining clarity in our relation to the sentences of our language that we call upon to express our thoughts.1 To say that early Wittgenstein already aspired to such a conception of philosophy is not to gainsay that to aspire to practice philosophy in such a manner and to succeed in doing so are not the same thing. It is therefore not to deny that, by Wittgenstein’s later lights, the Tractatus is to be judged a work that is marked by forms of failure tied to its having failed fully to live up to such an aspiration. But if it is thus to be judged, then it is to some degree a failure even by Wittgenstein’s own earlier lights. This means that if one wants to understand the fundamental turn in Wittgenstein’s thinking as he moves from his earlier to his later philosophy, and why it is that he wanted the Tractatus to be published and read together with Philosophical Investigations, one needs to understand what sort of failure this is —and that requires coming to terms with the Tractatus’s own understanding of what sort of work it was trying to be. We think that readers of the Tractatus-be they admirers or detractors of Wittgenstein-have, on the whole, failed to do this.