 Following the completion of Principia, Whitehead and Russell began to go their separate ways (cf. Ramsden Eames 1989, Desmet &amp; Weber 2010, Desmet &amp; Rusu 2012). Perhaps inevitably, Russell’s anti-war activities and Whitehead’s loss of his youngest son during World War I led to something of a split between the two men. Nevertheless, the two remained on relatively good terms for the rest of their lives. To his credit, Russell comments in his Autobiography that when it came to their political differences, Whitehead