 As Hempel uses the term, reasoning is “scientific” when it involves inferences with laws. Indeed, this appears to be the principal ground upon which he wants to maintain that explanations, predictions, and postdictions share the same logical form. His position here makes it logically impossible for explanations, predictions and postdictions to not have the same logical form. If there are modes of prediction that are non-explanatory, such as might be the case when they are based upon accidental generalizations, then they would not thereby demonstrate that the symmetry thesis does not hold for the kinds of distinctively “scientific” explanations that are the focus of his work. Scriven’s cow example, for example, does not show that the symmetry thesis does not hold for scientific explanations and scientific predictions, even if it shows that some ordinary predictions are not also ordinary explanations. But other counter-examples posed greater threats.