  It is Ramsey’s ontological views on the particular-universal distinction that have attracted the most attention. On the historical front, Ruth Barcan Marcus (1993) argues that Ramsey’s “Universals” bore a significant influence on Russell’s subsequent intellectual development; see MacBride 2004 and Hochberg 2004 for further discussion. MacBride (2018) puts Ramsey’s “Universals” in historical context, arguing that “Universals” should be interpreted as the final stage in an extended conversation about particulars and universals, involving G.E. Moore, Russell, Wittgenstein and Whitehead. Misak (2020) explores the connection between “Universals” and Ramsey’s later pragmatist writings. Braithwaite (1926) and Strawson (1959, chapter 5) argued, contra Ramsey, that the particular-universal distinction may be understood in spatio-temporal terms. See MacBride 2005c and Lowe 2006 (chapter 7) for further discussion of Ramsey’s views on universals from a contemporary point of view.