Existence he devotes six whole chapters to discuss it (1927: Chs. 44–9). The C-series is rarely given much attention. When it is mentioned, it is described as "an expression synonymous with 'B-series' when the latter is shorn of its temporal connotations" (Shorter 1986: 226). There is a grain of truth in this, but there is more to the C-series than this. Stripping the temporal features from the B-series only gives what the C- and B-series have minimally in common, notably the constituents of the series and the formal characteristics of being linear, asymmetric, and transitive. However, the C-series has features that the B-series does not have. The constituents of the C-series are mental states (a consequence of McTaggart's argument in Ch. 34 of The Nature of Existence that reality cannot really be material), which are related to each other on the basis of their conceptual content in terms of being included in and inclusive of (1927: sect. 566 & Ch. 60). These atemporal relations are meant to provide what the earlier/later than relation cannot, notably explain why an illusion of change and temporal succession can arise in an atemporal reality. Influence McTaggart's argument has had an enormous influence on the philosophy of time. His phenomenological analysis of the appearance of time has been accepted as good and true even by those who firmly deny the end conclusion that time is unreal. For instance, J. S. Findlay (1940) and A. Prior (1967) took McTaggart's phenomenological analysis as their point of departure in the development of modern tense logic. McTaggart's characterisation of the appearance of time in terms of the A- and B-series served to sharpen the contrast between the two emerging and rival views of time that we now know as the A- and B-views of time. The assumption is that the A-view, in accepting the reality of tense, represent time as being like an A-series, and that the B-view, in rejecting the reality of tense, represent time as being like a B-series. The two objections that McTaggart develops against the conception of time as forming an A- and a B-series are still the two main objections with which the A- and B-views of time struggle. Notably, is the A-view contradictory, and is the B-view able to incorporate an account of change? The controversy about McTaggart's argument for the unreality of time continues unabated (see, for instance, Smith 2011; Cameron 2015;