PHILOSOPHY. By J. BURNETT, F.B.A., Professor of Greek in the University of St. Andrews 57 MATHEMATICS AND ASTRONOMY. By Sir T. L. HEATH, K.C.B., K.C.V.O., F.R.S. 97 NATURAL SCIENCE. By D'ARCY W. THOMPSON, F.R.S., Professor of Natural History in the University of St. Andrews 137 BIOLOGY. By CHARLES SINGER, Lecturer in the History of Medicine in University College, London 163