Three lectures by the liveliest old grey head in the business -- an examination of modern science and the influence of pragmatism on our society. The first two lectures are concerned with the influence of science on ""unfounded"" traditional beliefs and the development of scientific technique. In the third lecture Professor Russell contests the foundations of pragmatism and its results in encouraging expediency in politics and discouraging a search for knowledge based on observation rather than ""self-assertion"". Although pointing out the pitfalls of a philosophy derived from modern science, however, Russell also mentions the physical advantages of scientific improvements and resultant social change.