The Book of Common Order contained, as has been mentioned, in its early editions, the complete Psalter, and to this were added, subsequently, a few Scripture Hymns, together with the Doxology _Gloria Patri_ in different metres, so that it could be sung at the end of every Psalm. This Doxology appears in Hart's edition of the Book of Common Order of 1611, in six different metres, under the general head of "Conclusions," and was evidently used regularly at the close of the Psalms sung in public worship. It was not until the beginning of the seventeenth century that there began to arise criticisms of the custom of singing the Doxology, and it would, therefore, appear that during the formative period of the Scottish Church, which we are considering, it was regularly used, and occasioned no objection and aroused no opposition. The Hymns which were printed with the Psalter were few in number, and were chiefly free paraphrases of sections of Scripture. They are "The Ten Commandments," "The Lord's Prayer," "_Veni Creator_," "The Song of Simeon called _Nunc Dimittis_," "The Twelve Articles of the Christian Faith," and "The Song of Blessed Marie called _Magnificat_." The purpose of the Hymns appears to have been the memorizing of Scripture and important doctrinal truths, and there is no evidence that they were employed in public worship, although a place was not denied them in the Book of Common Order; in the Order for Public Worship mention is made of Psalms only, and in all the accounts, which have come down to us in correspondence or history, of the public services of that time, the people are invariably spoken of as joining in a Psalm, while even in the public processions, which were common on occasions of national rejoicing or thanksgiving, Psalms only are mentioned as being sung by the people. The singing was usually led by the Reader, but there is occasional mention in the records of the time of the "Uptaker" of the Psalms, who evidently performed the duties of a Precentor. The Sacraments.--In the Confession of Faith, which forms the first part of the Book of Common Order, it is clearly stated that there are two Sacraments only in the Christian Church, and that these are Baptism and The Lord's Supper. No subject in connection with the practice of the Church created more discussion in Reformation times than the methods which were to be followed in the administration of the Sacraments. The spirit of the Scottish reformers is indicated in the following sentence, which governed this matter: "Neither must we in the administration of these Sacraments follow man's fancy, but as Christ himself hath ordained so must they be ministered, and by such as by ordinary vocation are thereunto called." In accordance with this general regulation the Book of Common Order prescribes in detail "The Manner of the Administration of the Lord's Supper." The words of the opening rubric are as follows: