 The question of how to distinguish between remembering and imagining is importantly ambiguous. On the one hand, we sometimes remember but do so in a way that is in some sense inadequate; in such cases, we naturally say that we are “only imagining”. The question can thus be taken to concern the distinction between cases in which the subject remembers successfully and cases in which he remembers unsuccessfully. On the other hand, we sometimes think about the past in a way that does not amount to remembering at all; in such cases, too, we naturally say that we are “only imagining”. A criterion of mnemicity must therefore distinguish both between successful and unsuccessful remembering and and between remembering, whether successful or unsuccessful, and mere imagining.