The four Gospels, each telling in its own way the story of the Life of Jesus, are the rich heritage of Christians. No one of the Gospels could be spared. But in reading any one of the four we miss some of the familiar words and incidents we love. Almost from the days of the Apostles there have been attempts to unite the Gospels in a single narrative. The first of these efforts, so far as we know, was undertaken by the devout scholar Tatian, soon after 173 A. D. His book served a useful purpose in his own and later generations, and is now a valuable witness to the antiquity and early acceptance of our four Gospels.