It is occasionally tempting, after climbing a mountain, to use the elevation one has gained to dash up to the top of a connected peak which does not have sufficient interest to induce one to climb so high for its sake alone. It is in this spirit that I turn to Geach's Latin Prose theory of relative clauses. The matter itself is of no very great moment, and some new ground will have to be covered in dealing with Geach's arguments. (...) Nevertheless we shall primarily be applying the theory constructed in the body of the paper, and when one is in a position to expose bad arguments relatively rapidly, it is perhaps a good idea not to leave them unchallenged, especially when they appear to be gaining currency. (shrink)

This paper falls into two parts. In the first part, I argue that consideration of general indicative conditionals, e.g., sentences like If a donkey brays it is beaten, provides a powerful argument that a pure material implication analysis of indicative if p, q is correct. In the second part I argue, opposing writers like Jackson, that a Gricean style theory of pragmatics can explain the manifest assertability conditions of if p, q in terms of its conventional content – assumed to (...) be merely (p⊃q) – and the conversational implicature contents which utterance of if p, q may gain in certain contexts. I also defend the pragmatic approach against a recent objection by Edgington that appeal to pragmatics cannot explain what we are inclined to say about the believability conditions, as opposed to the assertability conditions, of indicative if p, q. (shrink)

Peirce's example puts another nail in the coffin of the truth-functionality thesis. Conditionals are not truth-functional.