Paging irregular.

Mimeographed text.

Includes tables of contents.

Among the very few copies made of notes that Wittgenstein dictated to his class at Cambridge during the 1933-1934 session and which, from the colour of the bindings, came to be known as the Blue book.

These notes constitute the preliminary studies for the Philosophical investigations.

This copy made by Margaret Macdonald.

Fisher Walsh copy: With the autograph of J.A. Lauwerys. In original blue cloth with gilt lettering.