 The charge that the memory criterion conflicts with the transitivity of identity was illustrated by the famous case of the schoolboy, the young lieutenant and the elderly general (Reid 1975). The elderly general can Q-remember enough of what happened to the young lieutenant to qualify, by the memory criterion, as being the same person as the young lieutenant. The young lieutenant in turn Q-remembers enough of what happened to the young schoolboy. But the elderly general can remember almost nothing of what happened to the young schoolboy. Since the memory criterion has it that A Q-remembering enough of what happened to B is a necessary condition for A being the same person as an earlier person B, it follows that, according to the memory criterion, the elderly general is not the same person as the young schoolboy. Hence, the memory criterion implies, contrary to the transitivity of identity, that, although the elderly general is the same person as the young lieutenant, and the young lieutenant is the same person as the schoolboy, the elderly general is not the same person as the young schoolboy.