 Though he was open-minded about the “disparity conception” during this period, it was only in the spring of 1941, according to Carnap’s autobiography, that he “began to reconsider the whole problem of probability” (1963a: 72). He re-read Keynes’s book more carefully, and found it very enlightening (ibid.). He began to develop a new conception of confirmation, influenced by both Waismann and Keynes: 