. "He is also helped in the book by some superb diagrams that really do add much to the book and are a great help in understanding the somewhat more complex parts of the text.This tiny book (about the size of a pocket diary) of around 160 pages is part of an ongoing series that now stands at over 350 volumes on such subjects as Wittgenstein, The Spanish Civil War, Probability and so on.In this volume" . . .