This volume brings into focus the unique philosophical and historical importance of Wittgenstein's pre-Tractatus writings. These contributed essays show that Wittgenstein’s earliest writings are worth studying for their own sake. The volume thus offers not only a fresh perspective on the pre-Tractatus writings, but also a comprehensive reading of a wide range of central topics from the very first letters, the “Notes on Logic”, the “Notes dictated to G.E. Moore” to the three surviving war-time notebooks.