CATECHISM. From a word meaning to instruct by word of mouth. The insertion of this elementary exposition of Christian Faith and Practice into the Prayer Book is a feature of the Reformation. The Catechism, as drawn up in 1549, finished with the explanation of the Lord's Prayer. The explanation of the Sacraments was not added until 1604. Bishop Overall is believed to have written it. The Catechism formerly stood in the Confirmation Service, but was placed in its present position in 1661. The first rubric at the end of the Catechism has for a long time been rendered practically obsolete by the institution of Sunday Schools and Children's Services.