Thanks JL for his well-informed comments on Grice's paper. I have to admit that I don't fully understand the relevance of some of Grice's examples to the subject at hand, but perhaps I would understand it on a more careful reading. As I understand, Grice says that a statement like: "I saw a cat" conventionally implies that there really was a cat, and if a speaker is using it differently, i.e. without this implication, or without necessarily committing himself to it, then this is disimplicature. We may choose to call it disimplicature or some other such term but nevertheless there are such 'loose' uses of see in every-day language. My mention of Aristotle was rather offhand and, even though I mentioned the Aristotelian view of causality as comprising efficient cause, formal cause, material cause and final cause, what I suggested about perception differs from Aristotle's own view on the subject. For Aristotle, the perceiver receives the sensible form of the object, thus presumably the formal cause of perception would be contained in the object itself. (Although the potentiality to receive the form needs to be present in the receiver.) Since I have at hand a paper by Mortimer Adler, " Sense Cognition: Aristotle vs. Aquinas" I thought that I would quote a part of it. Adler says that the Aristotelians and the Thomists agree that: (a) that, in the case of material composites, the form of that which is knowable and can become actually known (i.e., the form of the quod) must be received in the knower, separated from or without its matter (i.e., the matter to which it is united in the quod); A distinction is further made between 'sensible forms' and 'intelligible forms'. Well, perhaps this can be of some use, I might write more later if I get some ideas. O.K.