These works, as the sub-title makes clear, are unfinished sketches for Philosophical Investigations, possibly the most important and influential philosophical work of modern times. The 'Blue Book' is a set of notes dictated to Witgenstein's Cambridge students in 1933-1934: the 'Brown Book' was a draft for what eventually became the growth of the first part of Philosophical Investigations. This book reveals the germination and growth of the ideas which found their final expression in Witgenstein's later work. It is indispensable therefore to students of Witgenstein's thought and to all those who wish to study at first-hand the mental processes of a thinker who fundamentally changed the course of modern philosophy.
There could be no better introduction to Wittgenstein's thought than the Blue Book, whose simplicity and forthrightness must make aninstant appeal. The progressive complications of the Brown Book makea natural bridge to the still more subtle, but often confusing,exposition of the Investigations. Every serious student of philosophy will want to own this volume.