In a message dated 4/1/2011 10:15:23 A.M., donalmcevoyuk@xxxxxxxxxxx writes: Sadly, Mackie died in 1981 so isn't around to retort." It is unclear to me why "All moral props are false" is, or ought to be, a moral proposition rather than just a claim pertaining to moral claims. Even if it were, Mackie would surely not have been so obviously logically self-defeating in formulating his stance? ---- Grice was fascinated by New-Zealand-born philosopher, J. L. Mackie. He (Grice) dedicated the first Paul Carus lecture (on the conception of value, now a book) to Mackie, "Inventing right and wrong". ----- "While I can see a point in inventing _right_," Geary assesses, "the point of inventing _wrong_ remains to be demonstrated (by argument)." Cheers, JL