Encouraged by the assured co-operation of competent Patristic scholars of Great Britain and the United States, I have undertaken the general editorship of a Select Library of the Nicene and Post-Nicene Fathers of the Christian Church. It is to embrace in about twenty-five large volumes the most important works of the Greek Fathers from Eusebius to Photius, and of the Latin Fathers from Ambrose to Gregory the Great.