Wittgenstein's enigmatic conception of sentences as pictures and his attempt to recast logic in essentially truth-functional terms have long fascinated readers of the Tractatus. I hope in this essay to clarify the content and motivation of Wittgenstein's view of sentences as pictures and to relate this conception to his views on logic. At the beginning of the foreword to the Tractatus, Wittgenstein tells his readers that the Tractatus is not a textbook, that perhaps only someone who has had the thoughts it expresses will understand it. The foreword also suggests that the Tractatus is in large measure a response to and critique of Frege's and Russell's views. My strategy then is to examine how aspects of the Tractatus emerge against the backdrop of problems that Frege's and Russell's views posed for Wittgenstein.

THE OLD LOGIC

Wittgenstein rejected Frege's and Russell's universalist conception of logic - what he disparaged as the old logic - while retaining their inchoate but guiding assumptions first that logic frames all thought, and second that it is possible to give a clear, completely explicit, and unambiguous expression to the contents judged true or false. To begin with, let us survey some of the leading features of the old logic and then consider briefly some of Wittgenstein's dissatisfactions with it.