The words 'upon it' require the cloth to lie upon the Mensa, or upper surface of the Table, but do not require the whole Table to be covered or enveloped therewith. The linen cloth is to be laid upon the covering described in Canon 82 as 'a carpet of silk or other decent stuff.' Bishop Cosin states that "among the Ornaments of the Church that were then (i.e. in the second year of Edward VI.) in use, the setting of two lights upon the Communion Table or Altar was one appointed by the King's Injunctions, set forth about that time, and mentioned or ratified by the Act of Parliament here named (2 & 3 Edw. VI. cap. I)." If it be contended that Bishop Cosin is wrong in his opinion that the Injunctions were obligatory, we are thrown back upon the universal custom of the Catholic Church, which undoubtedly required lights to be used on the Altar for the office of Holy Communion. 93. And the Priest standing at the North-side of the Table shall say the Lord's Prayer, with the Collect following, the people kneeling. One Priest only is here spoken of as celebrating: there is no authority for a change of the celebrant in the course of the Service; and only extraordinary contingencies of the gravest kind were anciently regarded as sufficient cause for such a change. Special provision is made for exceptions to this principle, in the pronouncing the Absolution by the Bishop, if officially present, and for the making the General Confession 'by one of the Ministers.' The Epistle and Gospel are also permitted to be read by Assistant Ministers, in accordance with customary usage recognised in the 24th Canon. The assistance of other Clergy may also be required for administration of the Elements. Lay Assistants are not mentioned in this rubric, but the principle of assistance to the 'principal Minister' being recognized in the twenty-fourth Canon, there can be no objection to the ancient practice of employing clerks or choristers for other purposes than singing.