 There is another issue that divides Bayesians. The package of Probabilism and the Principle of Conditionalization seems to explain well why one’s credence in General Relativity ought to rise in Eddington’s Observation Case. But that particular Bayesian explanation relies on a crucial feature of the case: the evidence E is entailed by the hypothesis H in question. But such an entailment is missing in many interesting cases, such as this one: