From the PREFACE . At the request of many Professors who teach the subject to the Intermediate classes in our Colleges, I have written this Introductory Text-book of Inductive Logic. I have tried to exclude from it all that would be unintelligible to those who begin to study the subject without any special scientific knowledge. The book presupposes only an elementary knowledge of Deductive Logic and an acquaintance with the phenomena of Nature, which a schoolboy acquires or may acquire in the ordinary course of his life. My object throughout has been. to produce a book which would promote the study of a subject which has been rightly regarded as an Introduction alike to Science and Philosophy. I trust that the study of this book will be a good preparation for a student, for his subsequent course, whether it be Philosophy or Science. The Introductory Text-book is completed in sixteen chapters specially designed for junior students. The Appendix contains additional matter for advanced students. In the Note (pp. 93-96) I have referred to certain points which should not, I thought, be entirely overlooked even in an Introductory Text-book. My best thanks are due to Mr. K. C. Bhattacharjee, M.A., P.R.S., Professor of Logic and Philosophy in the Bethune College, Calcutta, who has made many valuable suggestions in the course of perusing the manuscript and correcting the proof-sheets. I should be obliged if the Professors who may use this book, would communicate to me their suggestions for its improvement.