 Suppose Hempel were to resort to Goodman’s approach and deny that the negation of a purely qualitative predicates is also a purely qualitative predicate. That would mean that sentences logically equivalent to lawlike sentences—which have the same content—are not therefore also lawlike by invoking pragmatic differences in their degree of entrenchment and projectibility of their constituent predicates. An appeal to pragmatic considerations within this context has a decidedly ad hoc quality about it, which appears to contravene the spirit of the paradoxes of confirmation, where Hempel insists that the counterintuitive cases are confirmatory and their paradoxical character is merely psychological. Even if Hempel were to adopt this position and take for granted that one member of a class of logically equivalent sentences can be lawlike while the others are not, another difficulty arises from the use of modus tollens in lieu of modus ponens, as Figure 6 exemplifies: