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PREFACE THE aim of the following pages is fully stated in the Intro- ductory Chapter. Here I need only mention that some of the reflections in this book are taken from articles of mine in the Monist of 1908 and in Nature of 1909. To the Editors of these periodicals I wish to express my thanks for allowing me again to say some things which their kindness allowed me to say before. I must also thank those of my friends who have kindly read and helpfully criticised parts of this book. 872007
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