There are fifteen in the collection, but the second and third which are as long as the rest together, and are obviously extracts from the same work, are not by Hilary. He expressly says (Fragm. i. § 6) that he will commence with the council of Arles and the exile of Paulinus. These documents narrate at great length events which began six years earlier, and with which Hilary and his province had no direct concern. This proves that the fragments are not a portion of the Liber adversus Ursacium et Valentem. Internal evidence proves not less clearly that they cannot be excerpts from some other work of Hilary. In Fragm. ii. § 21 we are told that apparently in the year 349, Athanasius excommunicated Marcellus of Ancyra. It is of course, notorious that he never did so; the mistake is one which Hilary could not possibly have made. None the less, these fragments are both in themselves and in the documents which they embody, one of our most important authorities for the transactions they narrate, and are indisputably contemporary and authentic. Nor is there any reasonable doubt as to the genuineness of the thirteen. Those of them which reveal the inconstancy of Liberius have been assailed by some Roman Catholic writers, though they are accepted by others. The same suspicion has extended to others among the fragments, because they are found in company with these revelations concerning Liberius. But the doubts have been suggested by the wish to disbelieve.