JL said So, Guille is _manipulating_ a stimulus-response chain -- and that's the origin of 'non-natural' meaning, for Grice. For Grice _all_ meaning is non-natural (only analogically do we say 'smoke' means "smoked salmon"). This is not how I learned it. (I am weirded out by the smoked salmon example./ 5n 'Meaning,' there are (Grice claims) two sorts of meaning, natural ('Dark clouds mean rain,' 'These spots mean measles,' and non-natural, which is mostly talk, with a few gestures thrown in. But I could be wrong. Maybe that's not what he meant. Robert Paul