In the difficult task of translating the De Fide Orthodoxa—a task made the more difficult at times by the condition of the text,—I am indebted for much to my son, James L. Salmond, M.A., M.B., formerly of Balliol College, Oxford. There still remain passages of doubtful interpretation. It was intended to furnish a larger body of Notes and also an account of John and his writings. It has been found advisable, however, to complete the volume without these.