Degrees of reality in Plato / Gregory Vlastos -- Plato and the mathematicians / R.M. Hare -- Dialectic in the academy / Gilbert Ryle -- Aristotle on the snares of ontology / G.E.L. Owen -- Aristotle's conception of substance / D.M. MacKinnon -- Aristotle's distinction between Enereia and Kinesis / J.L. Ackrill -- Thought and action in Aristotle / G.E.M. Anscombe -- Aristotle on justice: a pardigm of philosophy / Renford Bambrough