I would like to thank the participants of a seminar I gave at UCL on Sellars for very helpful discussion of “Empiricism and the Philosophy of Mind”. For discussion from which I have learned much I would like to thank Tom Avery, Craig French, Gabriel Lakeman, Mike Martin, Paul Snowdon, and Mike Williams. I am especially indebted to Rory Madden and Charles Travis. The first for continually pressing me about the epistemological significance of perception as the naïve realist conceives it to be. The second for getting me to think hard about early twentieth century Oxford realism.