During the last half century there has been revolutionary progress in logic and in logic-related areas such as linguistics. HistoricaI knowledge of the origins of these subjects has also increased significantly. Thus, it would seem that the problem of determining the extent to which ancient logical and linguistic theories admit of accurate interpretation in modern terms is now ripe for investigation. The purpose of the symposium was to gather logicians, philosophers, linguists, mathematicians and philologists to present research results bearing on the above problem with emphasis on logic. Presentations and discussions at the symposium focused themselves into five areas: ancient semantics, modern research in ancient logic, Aristotle's logic, Stoic logic, and directions for future research in ancient logic and logic-related areas. Seven of the papers which appear below were originally presented at the symposium. In every case, discussion at the symposium led to revisions, in some cases to extensive revisions. The editor suggested still further revisions, but in every case the author was the finaljudge of the work that appears under his name.

One Ancient Semantics.- Aristotle on Spoken Sound Significant by Convention.- Inarticulate Noises.- Notes for a Linguistic Reading of the Categories.- Two Modern Research in Ancient Logic.- Greek Mathematics and Greek Logic.- Modern Notations and Ancient Logic.- Three Aristotle's Logic.- Aristotle's Natural Deduction System.- Corcoran on Aristotle' Logical Theory.- Four Stoic Logic.- Deduction in Stoic Logic.- Remarks on Stoic Deduction.- Five Final Session of the Symposium.- Future Research on Ancient Theories of Communication and Reasoning.- A Panel Discussion on Future Research in Ancient Logical Theory.- Index of Names.