The subject which has been chosen for me is sufficiently comprehensive. Several years ago I wrote the last of a series of essays in a book called Science, Religion, and Reality, in which, as requested, I tried to sum up the contributions of the other writers, with reflections of my own. I have also given a short statement of my opinions in the first volume of that interesting book, Contemporary British Philosophy. Lastly, I have tried, in a book published in the autumn of 1933, to consider the religious and philosophical implications of recent scientific theories and discoveries, and particularly of the conviction held by our leading astronomers and mathematicians that the Second Law of Thermodynamics is unassailable, so that the ultimate extinction of the universe as we know it is certain. I showed that the acceptance of this verdict raises important questions for the philosopher and theologian.