 This argument is vulnerable to the following two important criticisms: First, it conflicts with the common sense principle that (1) the material of an object can be totally replenished or replaced without affecting its identity (Salmon 1979); and secondly, as mentioned, it conflicts with the additional common sense principle that (2) replacement by a single part or small portion preserves identity. These objections may seem to provide sufficient grounds for rejecting the Kripkean argument and perhaps restricting the application of Kripke’s original argument for the necessity of origin (Noonan 1983). There is, however, a rather striking problem with (2), and it is unclear whether the conflict between (1) and the Kripkean argument should be resolved in favor of the former.