 Secondary literature on Alexander’s spacetime metaphysics includes Brettschneider (1964), Broad (1921a,b), Murphy’s (1927–1928) series, Emmet (1950), Thomas (2013), Fisher (2015), and Rush (2021). Schaffer’s (2009) argues for the identification of spacetime with matter, and traces this line of thought to Alexander. Secondary literature on Alexander’s account of mind-body emergence include classic critiques from Broad (1921a,b), Calkins (1923) and Emmet (1950). Stout (1922) discusses and rejects Alexander’s theory of perception. There has been more recent work on Alexander’s account of emergence in general; see McLaughlin (1992), Gillet (2006), and O’Connor and Wong (2012).