¹ The most substantive attempt at conceiving of a second temporal dimension is to be found in the addendum to Thomson, Judith Jarvis's ‘Time, Space, and Objects’Google Scholar (Mind, 01 1965Google Scholar). Interestingly enough, Thomson makes a ‘spatializing’ assumption similar to that made by Wilkerson. For a discussion of this, and other problems with Thomson's project, cf. my ‘Two-dimensional Time’ (Philosophical Studies, 05 1976).Google Scholar