Several of the chapters of this book were read in draft to seminars and philosophical societies in various parts of England. I am grateful to those who took part in the discussion at such meetings for many helpful criticisms. I am particularly indebted to Mr Anthony Quinton, Miss Elizabeth Anscombe, Mr Peter Geach, and Professor A. N. Prior for their kind encouragement and for numerous valuable suggestions. I must thank also Mr David Pears, Mr Patrick Gardiner, and Mr Roy Holland for pointing out several mistakes which I have tried to correct. I must also record my gratitude for having been allowed to consult some unpublished notes of Wittgenstein's which were of great assistance in the writing of Chapter Three.
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