 Earlier Cup is nontheless identical with later Cup in a loose and popular sense. What then, according to Chisholm, is it for earlier Cup and later Cup to be identical in a loose and popular sense? To simplify let us suppose, unrealistically, that the only change of parts that Cup in, Chisholm would say, a loose and popular sense undergoes is loss of a handle. Call Hcup the object that consists of Cup's handle together with Tcup. Chisholm would say this. Cup is earlier wholly constituted by Hcup, that is Tcup plus handle, and later wholly constituted by Tcup alone. Moreover Tcup is related to Hcup in such a way that, as Chisholm puts it, Tcup at t2 is the ens successivum of Hcup at an earlier time t1. For Chisholm what makes Tcup at t2 an ens successivum of Hcup at t1 seems to be this. Tcup is a proper part of Hcup at t1. There is a sequence S of cups such that each member of S that is not identical with Hcup is, at some time, a proper part of some member of S. For each time between and including t1 and t2 Cup is wholly constituted by some member of S.