 Although this is rarely noted, Cook Wilson is one of the forerunners of what we now call ‘trope theories’. What Edmund Husserl called ‘moments’ and later on G. F. Stout called ‘characters’ and D. C. Williams ‘tropes’, Cook Wilson called instead ‘particularization of the universal’ (SI, 336) or ‘particularized qualities’ (SI (713), Mulligan et al. (1984, 293 n.13)). Among his contemporaries, Cook Wilson’s ideas stand indeed closest to both Stout’s and Husserl’s. He seems not to have known about the latter, but one noticeable common feature concerns ‘dependence’ (Mulligan et al. 1984, 294). Cook Wilson suggested towards the end of his life that ‘things’ taken in themselves should be called ‘existences’ (SI, 713) and, keeping close to the language of Aristotle (τόδε τι, ‘a this’), he defined an ‘existence’ as ‘a this such and such’ (SI, 713). Starting with the subject-attribute distinction, in the case of an existence where the subject is said to be a ‘substance’, he argued that the “ordinary conception” of its ‘attribute-element’ is that it is “always a dependent reality” (SI, 157), with these “dependent existences” having in turn further existences dependent on them (SI, 153).