For the Gregorian Sacramentary, the edition most frequently employed is that of Menard printed in Migne. According to the introduction, it is taken from a _codex S. Eligii_ and a somewhat later _codex Rodradi_, which, in Menard’s opinion, was written about 853, but even the earlier codex has additions belonging to a later period, _e.g._ Projectus (25th January)[807] and Leo (28th June), as a comparison with the Mainz codex of St Alban shows. This codex (_i.e._ of St Eligius) according to the received opinion, was written between 834 and 847, and consists of three different parts, proceeding indeed from the same hand, but clearly distinguished from one another. The first part contains the _Gregorianum_ (fol. 1-129) to which have been added as an appendix the Masses of St Alban, SS. Sergius and Bacchus, All Saints’, and St Augustine, which the transcriber did not find in the original. In the second part (Collectio ii., fol. 165-183) the expressions _contestatio_ and _ad complendum_ are used which show it to be of Frankish origin, and like the first part it contains the ecclesiastical year, beginning with Christmas. The third part (fol. 183-204) contains a few additions consisting of prayers and Masses for special occasions. It is to be observed that the first part still has the obsolete feast of the 13th May, _Dedicatio S. Mariæ ad Martyrs_, and only the _Natalis S. Cæsarii_ on the 1st November, the Mass for All Saints’ being placed at the end, and not in its proper place (fol. 131). This recalls the circumstance that Gregory IV. (827-844) transferred the feast of the 13th May to the 1st November. This change was also introduced into the Frankish empire in 835. The original document was then certainly written before 835, or indeed earlier, for the _litania minor_, introduced into the Roman rite by Leo III. about 801, is not given; nevertheless the three chief feasts of our Lady are already inserted in their proper places. In the following period until the fifteenth century only a limited number of new saints’ days were added to the Roman Missal. A missal written in 1374—_Ordo Missalis secundum Consuetudinem Romanæ Curiæ_—belonging to the Public Library of Munich, shows an increase of only twenty-five Masses for saints’ days over the _Gregorianum_ after more than five hundred years.