in three parts: The Ordinary of the Mass; the Propers for the year beginning with Christmas Eve. They follow the ecclesiastical year; the feasts of saints (days of the month in the civil year) are incorporated in their approximate places in this. The Roman Stations are noted. There are still no Masses for the Sundays after Epiphany and Pentecost; the prayers for ordinations. Charlemagne, anxious to introduce the Roman Rite into his kingdom, wrote to Pope Adrian I between the years 781 and 791 asking him to send him the service-book of the Roman Church. The book sent by the pope is the nucleus of the Gregorian Sacramentary. It was then copied a great number of times, so that there are many versions of it, all containing additions made by the various scribes. The original book sent by Adrian to Charlemagne is easily distinguished from the different editions because the first to supplement Adrian's book from other sources was a conscientious person who carefully noted where his additions begin, adding a note: "So far the preceding book of Sacraments is certainly that edited by the holy Pope Gregory." In the earlier versions we may take the first part, down to this note, as being the book sent by Adrian. However, its attribution to Pope Gregory I (590-604) shows us that Gregory did much to reform the liturgy. A constant tradition ascribes such a work to him, as to Gelasius. John the Deacon (eighth century) in his Life of Gregory expresses this tradition: "He collected the Sacramentary of Gelasius in one book, leaving out much, changing little, adding something." Pope Adrian himself, in sending the book to Charlemagne, said that it was composed "by our holy predecessor, the divinely speaking Pope Gregory". The fact that the essential foundation of this sacramentary goes back to St Gregory, indeed to long before his time, is certain. We do not doubt that he made such changes as those that are acclaimed to him by his biographer, and that these changes stand in this book. But his work has not remained untouched, additions have been made to it since his time. For example, the addition of his own feast as well as other feasts that had not been celebrated before the seventh century. The book sent by Pope Adrian to Charlemagne has gone through inevitable development over the centuries since Gregory finished it. It represents