It is advisable, if not necessary, for me, by way of preface, to explain certain topics treated of in this book, which do not come under its title, and which, at first thought, may be taken to have but a remote connection with the ostensible subject of this treatise. These are: 1. The outbreak of Antinomianism which disfigured and distressed primitive Christianity. 2. The opposition of the Nazarene Church to St. Paul. 3. The structure and composition of the Synoptical Gospels. The consideration of these curious and important topics has forced its way into these pages, for the first two throw great light on the history of those Gospels which have disappeared, and which it is not possible to reconstruct without a knowledge of the religious parties to which they belonged. And these parties were determined by the fundamental question of Law or No-law, as represented by the Petrine and ultra-Pauline Christians. And the third of these topics necessarily bound up with the consideration of the structure and origin of the Lost Gospels, as the reader will see if he cares to follow me in the critical examination of their extant fragments.