My thanks are due to Professor John B. Watson and to Dr. T. P. Nunn for reading my mss. At an early stage and helping me with many valuable suggestions; also to Mr. A. Wohlgemuth for much very useful information as regards important literature. I have also to acknow ledge the help Oi the editor Of this Library Of Philosophy, Professor Muirhead, for several suggestions by which I have profited.
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