There is no clearer account of the difference in the reckoning of the days of the moon than that in the letter of Abbot Ceolfrid to Nectan, king of the Picts, given to us by Bede, and probably his own composition (_Hist. Ec._, B. v. c. 21). The ordinary idea that the British and Irish Churches derived their mode of keeping Easter from the Eastern Church, or from the disciples of St. John, is based upon a mistake, and arises from their being occasionally but erroneously termed quarto-decimans from their celebrating Easter on the fourteenth day of the moon when it fell upon a Sunday; but the Eastern Christians, to whom this name was properly given, differed essentially from them by invariably celebrating Easter on the fourteenth day, whether it fell on a Sunday or not. Footnote 13: ‘Dominis Sanctis et in Christo patribus vel fratribus, episcopis, presbyteris, cæterisque sanctæ Ecclesiæ ordinibus.’—Migne, _Patrologia_, vol. 37, col. 264. Footnote 14: ‘Domino Sancto et in Christo apostolico patri Papæ.’—_Ib._ col. 226. Footnote 15: Hefele, _Concilien Geschichte_, vol. ii. p. 16. Footnote 16: This Catalogue was first published by Usher from two MSS., and is believed to be the work of Tirechan, the author of the annotations on the Life of Saint Patrick in the Book of Armagh. His period is the eighth century. Footnote 17: The Litany of Angus is contained in the Leabhar Breac, and also in the Book of Leinster. Footnote 18: This was certainly the Roman or Western Form. Footnote 19: The names of the kings are given, but it is unnecessary to add them. They reigned till the year 534. Footnote 20: Some retained the Roman Form, others adopted the Gallican introduced by David, Gillas, and Docus. Footnote 21: The kings mentioned reigned to the year 572. Footnote 22: This is followed by the names of twenty-five saints of this order. Footnote 23: The names of seven bishops and eight presbyters are given. Footnote 24: The Book of Armagh has been very inaccurately printed by Sir William Betham in his _Irish Antiquarian Researches_. An edition of this most valuable MS. has long been promised by the then Dean of Armagh, now Bishop of Down, and it is hoped that he will still accomplish it. It would be an invaluable boon to all students of Church history. See _Proceedings of the Royal Irish Academy_, vol. iii. pp. 316, 356, for an account of this MS. and of the authors of the lives. Footnote 25: The author adopts the theory that the summary of Aidus appended to the annotations of Tirechan contains the headings of the chapters of the first part of Muirchu’s life. Footnote 26: Betham, _Ant. Res._, App. pp. i, ii, and xliii. Footnote 27: