"Friday mg." "But [Broad] is very much abler than any of my present pupils except Wittgenstein. He is much the most reliable pupil I have had—practically certain to do a good deal of useful but not brilliant work; whereas W. [Wittgenstein] only knows a small proportion of what he ought to know, and is mad and erratic—there is no guessing what he will do. He is full of boiling passion which may drive him anywhere."