to prove that the Diatessaron was composed of our present Gospels. It was suggested that it might have been drawn from other Gospels more or less resembling those which we now possess. This idea has now been dispelled. A great Syrian father, Ephraim, who died in 373, wrote a commentary on the Diatessaron. This was preserved in an Armenian translation which was made known to the world in 1876. The discovery proved that the Diatessaron had been drawn from our four Gospels. In 1886 an Arabic version of the Diatessaron itself was found, and it {12} proved conclusively that Tatian's Diatessaron was simply a combination of our four canonical Gospels. About the same date as Tatian, a famous Gnostic writer named Heracleon wrote commentaries on Luke and John, and it can also be shown that he was acquainted with Matt. There can therefore be no doubt that all our four Gospels were well known by A.D. 170. Between A.D. 130 and 170 our Gospels were also in use. The most important evidence is furnished by Justin Martyr, who was born near Samaria, and lectured in Rome about A.D. 152. He says "the apostles handed down in the Memoirs made by them, which are called Gospels;" he shows that these Memoirs were used in Christian worship, and he says that "they were compiled by Christ's apostles and those who companied with them." This exactly agrees with the fact that the first and the fourth of our Gospels are attributed by the tradition of the Church to apostles, while the second and the third are attributed to companions of the apostles. The quotations which Justin makes show that these Memoirs were our four Gospels. It has been thought that Justin perhaps used some apocryphal Gospel in addition to our Gospels, but there is no sufficient proof of this. We may explain that he uses the term "Memoirs" in order to make himself intelligible to non-Christian readers who would not understand the word "Gospel." The _Shepherd_ of Hermas, which was written at Rome, probably about A.D. 140, but perhaps earlier, uses expressions which imply an acquaintance with all our Gospels, though none of them are directly quoted. Moreover, the _Shepherd_, in depicting the Christian Church as seated on a bench with four feet, probably refers to the four Gospels. This would be in agreement with the allegorical style of the book, and it gains support from the language of Origen and Irenaeus.