Although Aranyosi's claim that McTaggart's "set of parts" is a set rather than a fusion is correct, his attempt to restate McTaggart's conception needs revision. Aranyosi argues that "the fusion of cats is identical with the fusion of all cat-parts, 'regardless of whether all cat-parts are parts of cats or not.'" Fusions have unique decompositions into what David Lewis calls "nice parts." Cats are nice parts of cat fusions, as are maximal spatio-temporally connected parts. Part of Aranyosi's argument fails when (...) it deals with cats; part of it fails when it deals with maximal spatio-temporally connected parts. He does not identify one kind of nice part that allows his whole argument to go through. (shrink)