Third series : On Variable Arguments, addressed to Athenades, one book. (Tliis also is spurious.) Variable Arguments concerning the Mean, three books. (Spurious.) A Reply to Ameinias' " Disjunctive Syllogisms," one book. Fourth series : On Hypotheses, addressed to Meleager, three books. Hypothetical Syllogisms upon the Laws, again addressed to Meleager, one book. Hypothetical Syllogisms to serve as Introduction, two books. Hypothetical Syllogisms consisting of Theorems, two books. Solutions of the Hypothetical Arguments of Hedylus, two books. Solutions of the Hypothetical Arguments of Alexander, three books. (Spurious.) On Explanatory Symbols, addressed to Laodamas, one book. Fifth series : Introduction to the Mentiens a Argument, addressed to Aristocreon, one book. Arguments of the Mentiens Type, to serve as Introduction, one book. Of the Mentiens Argument, addressed to Aristocreon, six books. Sixth series : Reply to those who hold that Propositions may be at once False and True, one book. To those who solve the Mentiens by dissecting it, addressed to Aristocreon, two books.