This has led some critics to conclude that the summary is by another hand. There is nothing in the literary manners of the age to compel us to reject this supposition, and similar cases have been quoted. The evidence of style is, however, against it, and it is unlikely that if the summarizer were any other person than Hippolytus, he would have taken up Hippolytus’ personal quarrel against Callistus. Yet in the text of Book X before us the charge of heresy against Callistus is repeated, although perhaps with less asperity than in Book IX, the accusations against his morals being omitted. Nor is it easy to dissociate from Hippolytus the really eloquent appeal to men of all nations to escape the terrors of Tartarus and gain an immortality of bliss by becoming converted to the Doctrine of Truth with which the Book ends, after an excursion into Hebrew Chronology, a subject which always had great fascination for Hippolytus. Although the matter is not beyond doubt, it would appear, therefore, that the summary, like the rest of the book, is by Hippolytus’ own hand. In these circumstances there is but one theory that in the opinion of the present writer will reconcile all the conflicting facts. This is that the foundation of our text _is_ the synopsis that Hippolytus made, as Photius tells us, after receiving instruction from Irenæus; that those notes were, as Hippolytus himself says, “set forth” by him possibly in the form of lectures, equally possibly in writing, but in any case a long time before our text was compiled; and that when his rivalry with Callistus became acute, he thought of republishing these discourses and bringing them up to date by adding to them the Noetian and other non-Gnostic heresies which were then making headway among the Christian community, together with the facts about the divinatory and magical tricks which had come to his knowledge during his long stay in Rome. We may next conjecture that, after the greater part of his book was written, chance threw in his way the documents belonging to the Naassene and other Ophite sects, which went back to the earliest days of Christianity and were probably in Hippolytus’ time on the verge of extinction.[62] He had before determined to omit these sects as of slight importance,[63] but now perceiving the interest of the new documents, he hastily incorporated them in his book immediately after his account of the magicians, so that they might appear as what he with some truth said they were, to wit, the fount and source of all later Gnosticism. To do this, he had to displace the account of the Jewish and Samaritan sects with which all the heresiologists of the time thought it necessary to begin their histories. He probably felt the less reluctance in doing so, because the usual mention of these sects as “heresies” in some sort contradicted his pet theory, which was that the Gnostic tenets were not a mere perversion of Christian teaching,