The next important addition to the progress of the Reformation was the preparation and introduction of a Service Book[483]--_The Boke of the Common Praier and Administration of the Sacramentes and other Rites and Ceremonies after the use of the Churche of England_ (1549), commonly called _The First Prayer-Book of King Edward VI._ It was introduced by an _Act of Uniformity_,[484] which, after relating how there had been for long time in England "divers forms of Common Prayer ... the use of Sarum, York, Bangor, and of Lincoln," and that diversity of use caused many inconveniences, ordains the universal use of this one form, and enacts penalties on those who make use of any other. The origin of the book is somewhat obscure. There is no trace of any commission appointed to frame it, nor of any formally selected body of revisers. Cranmer had the chief charge of it, and was assisted by a number of divines--though where they met is uncertain, whether at Windsor as the King records in his diary, or at Chertsey Abbey, as is said in the Grey Friars Chronicle. About the end of October the Bishops were asked to subscribe it, and it was subjected to some revision. It was then brought before the House of Lords and discussed there. It was in this debate that Cranmer disclosed that he had definitely abandoned the theory of transubstantiation. The Prayer-Book, however, was eminently conservative, and could be subscribed to by a believer in the old theory. The giving and receiving of the _Bread_ is called the _Communion of the Body of Christ_, of the _Wine_, the _Communion of the Blood of Christ_; and the practice of making the sign of the Cross is adhered to at stated points in the ceremony. An examination of its structure and contents reveals that it was borrowed largely from the old English Use of Sarum, and from a new Service Book drafted by the Cardinal Quignon and dedicated to Pope Paul III. The feeling that a new Service Book was needed was not confined to the Reformers, but was affecting all European Christians. The great innovation in this Liturgy was that all its parts were in the English language, and that every portion of the service could be followed and understood by all the worshippers. With the publication of this _First Prayer-Book of King Edward VI._ the first stage of the Reformation during his reign comes to an end. The changes made had all been contemplated by Henry VIII. himself, if we are to believe what Cranmer affirmed. They did not content the more advanced Reformers, and they were not deemed sufficient by Cranmer himself.