The philosophy of science is today a major area in philosophy. The volumes in this set, published between 1923 and 1955 clearly show the development of this important field in the first half of the twentieth century. Scientific Thought, based on a course of lectures by the famous philosopher C.D. Broad in 1920-21, looks at many scientific theories, such as the theory of relativity, space, time and motion and mathematical physics. The Metaphysical Foundations of Modern Science, published in 1924, locates the main assumptions of modern science and compares them with those in medieval thought. Biological Principles looks at the general problems of the theory of knowledge and difficulties with biological knowledge. All the books in this set will make fascinating reading for those interested in comparing scientific thought during the first half of the twentieth century with current thinking.