 The acceptance or rejection of a scientific hypothesis becomes partially a practical matter, and to some degree a matter of convention. Carnap speaks in this connection of the “degree of confirmation” but means this not in a quantitative but merely “topological” (what he would later call “comparative”) sense. He specifically rejects Reichenbach’s proposal to equate degree of confirmation to “the degree of probability in the strict sense which this concept has in the calculus of probability, i.e., as the limit of relative frequency” (TM1: 427). Five years later Carnap would realize that the probability calculus could be given a different, epistemic interpretation as had been done historically by Bayes, Laplace, Pearson, and Keynes, and was now continued by Harold Jeffreys—and he would make that interpretation the basis of his remaining life’s work of developing quantitative explications of “degree of confirmation”. (For more details on Carnap’s work on confirmation and inductive logic, see the supplement  Inductive Logic.)