CC BY-NC 4.0. Original at the Bertrand Russell Archives at McMaster University Library, Hamilton, Ontario, where in 2015 this scan was produced. The image was post-processed at the Wittgenstein Archives at the University of Bergen and is reproduced here by permission of The Master and Fellows of Trinity College, Cambridge, and The Bertrand Russell Archives at McMaster University, Hamilton, Ontario. The sale, further reproduction or use of this image for commercial purposes without prior permission from the copyright holder is prohibited. © 2015 The Master and Fellows of Trinity College, Cambridge; The Bertrand Russell Archives at McMaster University, Hamilton, Ontario; The University of Bergen, Bergen.