 The later version of Geach’s argument needs a different response. The difference between the earlier version and the later one is that in the later (to be found in Geach 1973) Geach’s claim is not merely that Quine’s thesis about possible reinterpretation has a consequence which is unpalatable, but that it leads to an out-and-out logical absurdity, the existence of what he calls “absolute surmen” (entities for which having the same surname constitutes a criterion of absolute identity, i.e., entails indiscernibility in all respects). Because Geach is now making this stronger claim, the objection that his argument depends upon the incorrect assumption that sameness of truth-conditions entails sameness of ontological commitment is no longer relevant. In order to make out his case Geach has to establish just two points. First, that there are sentences of English supplemented by the predicate “is the same surman as” (explained to mean “is a man and has the same surname as”), which are evidently true and which, considered as sentences of that fragment of English in which “is the same surman as” is an I-predicate, when this is interpreted in the way Quine suggests, can be true only if absolute surmen exist. And secondly, that the existence of absolute surmen is absurd.