Whittaker wrote two other books pertaining to Eddington's philosophy. Whittaker also wrote at length about the impacts of then-recent discoveries in astronomy on religion and theology, determinism and free will, and natural theology. In the conclusion of his article, McConnell sums up Whittaker's philosophic works as appearing as though it came from "that of the scholarly Christian layman". On metaphysics, he goes on to note that there are few scholars who are competent in both physics and metaphysics and states that future work could benefit and draw inspiration from Whittaker's research in the area. Awards and honours In 1931, Whittaker received the Sylvester Medal from the Royal Society for "his original contributions to both pure and applied mathematics". He then received the De Morgan Medal from the London Mathematical Society in 1935, an award given once every three years for outstanding contributions to mathematics. He received several honours in his 70s, including being knighted in 1945 by King George VI, and in 1954, receiving the Royal Society's Copley Medal, its highest award, "for his distinguished contributions to both pure and applied mathematics and to theoretical physics". In the opening remarks of the 1954 address of President Edgar Adrian to the Royal Society, Adrian announces Whittaker as that years Copley medallist saying he is probably the most well-known British mathematician at the time, due to "his numerous, varied and important contributions" as well as the offices he had held. Noting contributions to nearly all fields of applied mathematics and then-recent contributions to pure mathematics, relativity, electromagnetism, and quantum mechanics, Adrian goes on to say that the "astonishing quantity and quality of his work is probably unparalleled in modern mathematics and it is most appropriate that the Royal Society should confer on Whittaker its most distinguished award." Whittaker also gave several distinguished lectures, some of which formed the base of books he would later write. He held the Rouse Ball lectureship at Trinity College, Cambridge in 1926, the Bruce-Preller lectureship of the Royal Society of Edinburgh in 1931, and the Selby lectureship at the University of Cardiff in 1933. He also held the Hitchcock professorship at the University of California in 1934, the Riddell lectureship at the University at Durham (Newcastle) in 1942, the Guthrie lectureship of the Royal Physical Society of Edinburgh in 1943, and the Donnellan lectureship at the Trinity College Dublin in 1946. He gave the Tarner Lecture at