 This, however, is only part of the story. Salmon believed that the answer to the key question “lies in connecting the common cause principle and Bayes’s theorem” (Salmon 1994a [2005: 25]). Although crediting him for having grasped the same idea, Salmon found Reichenbach’s treatment incomplete, because it contains only sketchy remarks in that regard. He therefore set himself the task of working out a detailed argument, spelled out in “Ornithology in a Cubical World” (1999) and “An Empiricist Argument for Realism” published as Chapter 3 of Reality and Rationality. In Salmon’s own words, his purpose was: