 The validity of the syllogism is fundamental and Anderson rejects the absolute independence from syllogistic reasoning of other forms of reasoning such as the relational, hypothetical and disjunctive. The syllogism demonstrates clearly that the subject in one proposition can function as the predicate in another. The difference between subject and predicate is purely one of function: the function of the subject term is to locate, that of the predicate to describe. There are not two classes of entities involved here; that is, there are no pure locations/particulars/substances, just as there are no pure descriptions/universals. There is no logical gap that needs to be spanned between subject and predicate terms: any term can play the role of particular or general, subject or predicate. 