 Contemporary Russellian monists often trace their view to Russell’s 1927 The Analysis of Matter, which they read as developing a structuralist account of physics. Indeed, some find in that book suggestions of not only structuralism about physics but the other main components of Russellian monism too (Lockwood 1992 [2015: 144–145]; Chalmers 1996: 166). On this interpretation, Russell there implied that what are now called quiddities might be identified with what he called percepts (Russell 1927a: 402). It has also been argued that he more explicitly endorsed the eponymous theory in some of his later writings, including Human Knowledge: Its Scope and Limits and My Philosophical Development (Wishon 2015; but see Stubenberg 2015).