The first set of works in this class, contains, the Art of Reasoning and of Modes, in five books, addressed to Dioscorides; a treatise on Reasoning, in three books; one on the Structure of Modes, addressed to Stesagoras, in five books; a comparison of the Elements of Modes; a treatise on Reciprocal and Conjunctive Reasonings; an essay to Agathon, called also an essay on Problems, which follow one another; a treatise, proving that Syllogistic Propositions suppose one or more other terms; one on Conclusions, addressed to Aristagoras; one essay, proving that the same reasoning can affect several figures; one against those who deny that the same reasoning can be expressed by syllogism, and without syllogism, in two books; three treatises against those who attack the resolution of Syllogisms; one on the treatise on Modes, by Philo, addressed to Timostratus; two treatises on Logic, in one volume, addressed to Timocrates and Philomathes; one volume of questions on Reasonings and Modes. The second set contains, one book of Conclusive Reasonings, addressed to Zeno; one on Primary Syllogisms, which are not demonstrative; one on the resolution of Syllogisms; one, in two books, on Captious Reasonings, addressed to Pasylus; one book of Considerations on Syllogisms; one book of Introductory Syllogisms, addressed to Zeno; three of Introductory Modes, addressed also to Zeno; five of False Figures of Syllogism; one of a Syllogistic Method, for the resolution of arguments, which are not demonstrative; one of Researches into the Modes, addressed to Zeno and Philomathes (but this appears to be an erroneous title). The third set contains, one essay on Incidental Reasonings, addressed to Athenades (this again is an incorrect title); three books of Incidental Discourses on the Medium (another incorrect title); one essay on the Disjunctive Reasons of Aminias. The fourth set contains, a treatise on Hypothesis, in three books, addressed to Meleager; a book of hypothetical reasonings on the Laws, addressed also to Meleager; two books of hypothetical reasoning to serve as an Introduction; two books of hypothetical reasonings on Theorems; a treatise in two books, being a resolution of the Hypothetical Reasonings of Hedylus; an essay, in three books, being a resolution of the Hypothetical Reasonings of Alexander (this is an incorrect title); two books of Expositions, addressed to Leodamas. The fifth set contains, an introduction to Fallacy, addressed to Aristocreon; an introduction to False Reasonings; a treatise in six books, on Fallacy, addressed to Aristocreon.