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From the introduction: We feel in placing this work before the public we should accompany it with some words of explanation. It is unique, presenting a combination of features never before collected in one work. Harmonies and Four-fold Gospels are plentiful, and we have examined a large number of them, beginning with the pioneer work of Tatian. We have sought to utilize all the good features employed by others, and to introduce several new and helpful inventions of our own.”