 Mackie described Anderson as the last of the Aristotelian logicians and observed some awkward consequences for his conception of logic: the problem of false propositions; the absence of a way of dealing with singular propositions; an inability to deal with multiple quantification; the difficulty in expressing relational propositions in subject-predicate and syllogistic form. For Mackie, any logic dealing with false propositions, relations of contradiction and contrariety, entertained arguments, falsifications and reductions ad absurdum must be something more than an account of propositions as what is there (Mackie 1985).