ABSTRACT
It is often maintained-I think with considerable plausibility-that powers are individuated at least partly by their manifestations. But it is also sometimes held that the manifestations of powers themselves always consist simply in the acquisition of further powers. This seems to raise the threat of a vicious circularity (or else an infi nite regress) in the individuation of powers, requiring us to acknowledge the existence of at least some power-manifestations-and hence some properties-that are not powers. Recently, a number of philosophers have appealed to structuralist considerations in order to avert this kind of threat, but in what follows I shall argue that such a strategy is doomed to failure. Some properties, I shall conclude, must indeed be non-powers.
