perhaps to make sense of the thoughts in list 2 we would invoke an ‘immaterial substance’—the mysterious, simple, soul of Me. It might even seem that these thoughts are sound enough to give some kind of argument for Cartesian dualism, it only being within that framework that they make any sense. But then Locke makes an extremely interesting move. We have seen that plants and animals survive change of material substance. So why shouldn’t persons (me, you) survive change of soul substance?