I argue that the numbering system of the Tractatus lets us see how it was constructed, in two closely related senses of that term. First, it tells us a great deal about the genesis of the book, for the numbering system was used to assemble and rearrange a series of drafts, as recorded in MS 104. Second, it helps us understand the structure of the published book, as cryptically summarized in the opening footnote. I also discuss an unpublished letter from (...) Anscombe to von Wright from 1948 which contains the very first sketch of a tree-structured reading, and what I believe is Stenius’s response to Anscombe’s proposal. The paper critically evaluates previous work on tree-structured readings and contends that we need to read the Tractatus in both the number order used in the published book and the tree order that Wittgenstein used to draft it. It also considers some of the main ways of turning this complex branching structure into a linear, printed text, and so serves as an introduction to the three tree-structured editions of the Tractatus that accompany this paper (the German text, and the translations by Ogden/Ramsey and Pears & McGuinness). (shrink)

Paragraph 50 of Wittgenstein'sPhilosophical Investigationsfamously says that there is one thing of which one can neither state that it is 1 m long nor that it isn't: the standard metre in Paris. Consensus appears to be that (1) exegetically speaking, Wittgenstein affirms this claim, and (2) systematically, whether or not one agrees with it, the practice of using a material artefact as a measurement standard has important philosophical consequences. In this paper, in contrast, we show that (1') Wittgenstein does not (...) affirm the standard metre claim and (2') historical facts about material length standards do not warrant deeper philosophical conclusions. References to material measurement standards in the literature gravely distort the actual metrological practices of developing and using such standards. (shrink)

I provide a motivation for Wittgenstein's holding to the view that a necessary condition of an item's possessing a sense is its being capable of truth and capable of falsehood. I argue that Wittgenstein adopted the relevant view in order to defend an approach to the determination of logical truth on which the subject matter of a proposition is irrelevant to our making such a determination. This approach was itself conceived of as a remedy to that employed by Russell, and (...) to a conception of logical truth on which the axiom of reducibility counts as logically true. (shrink)