THE present volume is the first of three, which will reproduce in English the contents of Vol. III. of Harnack's great work in the German original, third Edition. The author's prefaces to the first and second Editions and to the third Edition are here translated. This volume deals with the epoch-making service of Augustine as a reformer of Christian piety and as a theological teacher, and with the influence he exercised down to the period of the Carlovingian Renaissance. The following volume will complete the history of the Development of Dogma by telling the story of Medival Theology. The concluding volume will treat of the Issues of Dogma in the period since the Reformation, and will contain a General Index for the whole work.