Mediaeval Logic and Philosophy - Resource maintained by Paul Vincent Spade at Indiana University. Medieval Theories of Analogy - Entry in the Stanford Encyclopaedia of Philosophy, by E. Jennifer Ashworth. Medieval Theories of Modality - Article at the Stanford Encyclopaedia of Philosophy. Scholastic Logic - Chapter Two of Joseph Perrier's "The Revival of Scholastic Philosophy in the Nineteenth Century" (1909). Scholasticism - Online text by Joseph Rickaby (1908). Square of Opposition - Article in the Stanford Encyclopaedia of Philosophy, by Terence Parsons. Logic - Entry in the Catholic Encyclopaedia (1917), dominated by a historical survey from Indian and Pre-Aristotelian philosophy to the Logic of John Stuart Mill. Aristotle's Logic - Introductory article by Garth Kemerling. Peter of Spain (Petrus Hispanus) - Life and work of 13th century logician and author of the Tractatus; from the Stanford Encyclopedia by Joke Spruyt. On Dialectic - By St. Augustine. Latin original together with translation by J. Marchand.