  One might suppose that mere pointing is all that a demonstrative pronoun does, and certainly Priscian had claimed that while the name signifies substance with quality, that is, a referent plus its nature, the pronoun signifies substance without quality, that is, a bare referent (cf. §8).  However, medieval grammarians and logicians tended to demand some identification of the object denoted. One context for the demand is found in the discussion of constructions mixing first-person pronouns and first-person verb forms with proper names, which were counted as third-personal. Priscian took such locutions as “Priscian read” (Priscianus lego) to be ill-formed, and preferred the expansion, “I Priscian read” (Ego Priscianus lego). In his discussion of this sentence, Peter Helias placed the emphasis on the presence of ‘I’. He explained that “I” cannot pick out a form, so ‘Priscian’ has to be supplied in order for there to be a perfect subject. Nearly two and a half centuries later John Dorp appealed to the same grammatical doctrine in order to explain that the sense of the spoken phrase “I run” is either “I John run” or “I, a man, run.” The mental correlate of a personal pronoun must involve an identifying concept, whether singular or universal.