Myles Burnyeat (1939-2019) was a major figure in the study of ancient Greek philosophy during the last decades of the twentieth century and the first of this. After teaching positions in London and Cambridge, where he became Laurence Professor, in 1996 he took up a Senior Research Fellowship at All Souls College, Oxford, from which he retired in 2006. In 2012 he published two volumes collecting essays dating from before the move to Oxford. Two new posthumously published volumes bring together essays from his years at All Souls and his retirement. The essays in Volume 4 are addressed principally to scholars engaging first with fundamental issues in Platonic and Aristotelian metaphysics and epistemology and in Aristotle's philosophical psychology. Then follow studies tackling problems in interpreting the approaches to physics and cosmology taken by Plato and Aristotle, and in assessing the evidence for early Greek exercises in optics.