It is often said that there is no "philosophy of science", but only the
philosophies of certain scientists. But in so far as we recognize an
authoritative body of opinion which decides what is and what is not
accepted as present-day physics, there is an ascertainable present-day
philosophy of physical science. It is the philosophy to which those who
follow the accepted practice of science stand committed by their
practice. This book contains the substance of the course of lectures
which the author Eddington delivered as Tarner Lecturer of Trinity
College Cambridge in the Easter Term 1938. The lectures have afforded
him an opportunity of developing more fully than in his earlier books
the principles of philosophic thought associated with the modern
advances of physical science.