"Robert became much interested in science and scientific method; and he showed particular attention to optics, which he regarded as the key to an understanding of the physical world. He was conscious of the dual approach by means of induction and deduction (resolution and composition); i.e., from the empirical knowledge one proceeds to probable general principles, and from these as premises one them derives conclusions which constitute verifications or falsifications of the principles. This approach to science was not that far removed from Aristotle..."