  The standard case is represented by ‘this’ or by ‘this man’, and the mental correlate in both cases is a common concept singularized by a demonstrative act. Because ‘this’ is tied to particular demonstrative acts, Buridan, like many other logicians in the fourteenth, fifteenth and early sixteenth centuries, took it that genuine referring uses of the phrase ‘this man’ are equivocal. What I signify when I say ‘this man’ pointing to Socrates is quite different from what you signify when you say ‘this man’ pointing to Plato, and every use of the phrase requires a new imposition.  As Soto pointed out, this is quite compatible with the claim that ‘this man’ has an unchanging general sense which is understood by all speakers of Latin.  It is also compatible with failures of reference of various sorts, as Buridan and others frequently remarked. I can say ‘this man’ and point to a donkey, or to nothing. Similarly, I can utter ‘this chimera’, a phrase which can never have a referent, given that chimeras are impossible objects.