The substance of this book is the series of Gifford Lectures which were given in the Spring Term of 1924 in the University of Glasgow. In preparing the lectures for publication I have been glad of the opportunity of revising and expanding them. I have also thought it desirable to include the opening lectures of the second series which gather up the results of the inquiry into the Nature of Religion, and outline an argument in vindication of the Truth of Religion.

I am indebted to Dr. John Morrison for assistance in correcting the proofs, and to my daughter Elizabeth for the compilation of the index.

W. P. PATERSON.

Edinburgh, 9th Oct. 1925.