This book is based on my doctoral dissertation written at Harvard University in the year of 1963. My interest in Peirce was inspired by Professor D. C. Williams and that in Lewis by Professor Roderick Firth. To both of them lowe a great deal, not only in my study of Peirce and Lewis, but in my general approach toward the problems of knowledge and reality. Specifically, I wish to acknowledge Professor Williams for his patient and careful criticisms of the original manuscripts of this book. I also wish to thank Professor Firth and Professor Israel Scheffler for their many suggestive comments regarding my discussions of induc tion. However, any error in this study of Peirce and Lewis is completely due to myself. Chung-ying Cheng Honolulu, Hawaii March,1967 TABLE OF CONTENTS PREFACE V SUMMARY IX CHAPTER I: Introduction I I. Problem of Justifying Induction and Proposal for Its Dissolution I 2. Two Types of Recent Arguments for the Validity of Induction 3 Arguments from Paradigm Cases and Uses of Words 4 3."