Soloist and Organist. SECTION 1. The music in The Mother Church shall not be operatic, but of an appropriate religious character and of a recognized standard of musical excellence; it shall be played in a dignified and suitable manner. Music from the organ alone should continue about eight or nine minutes for the voluntary and six or seven minutes for the postlude, the offertory conforming to the time required to take the collection. The solo singer shall not neglect to sing any special hymn selected by the Board of Directors. Article XX--SUNDAY SCHOOL The Sunday School. SECTION 1. Pupils may be received in the Sunday School classes of any Church of Christ, Scientist, up to the age of twenty years, and by transfer from another Church of Christ, Scientist, up to that age, but no pupil shall remain in the Sunday School of any Church of Christ, Scientist, after reaching the age of twenty. None except the officers, teachers, and pupils should attend the Sunday School exercises. Teaching the Children. SECTION 2. The Sabbath School children shall be taught the Scriptures, and they shall be instructed according to their understanding or ability to grasp the simpler meanings of the divine Principle that they are taught. Subject for Lessons. SECTION 3. The first lessons of the children should be the Ten Commandments (Exodus 20: 3-17), the Lord's Prayer (Matt. 6: 9-13), and its Spiritual Interpretation by Mary Baker Eddy, Sermon on the Mount (Matt. 5: 3-12). The next lessons consist of such questions and answers as are adapted to a juvenile class, and may be found in the Christian Science Quarterly Lessons, read in Church services. The instruction given by the children's teachers must not deviate from the absolute Christian Science contained in their textbook. READING ROOMS Article XXI Establishment. SECTION 1. Each church of the Christian Science denomination shall have a Reading Room, though two or more churches may unite in having Reading Rooms, provided these rooms are well located. Librarian. SECTION 2. The individuals who take charge of the Reading Rooms of The Mother Church shall be elected by the Christian Science Board of Directors, subject to the approval of Mary Baker Eddy. He or she shall have no bad habits, shall have had experience in the Field, shall be well educated, and a devout Christian Scientist.[3] Literature in Reading Rooms. SECTION 3. The literature sold or exhibited in the reading rooms of Christian Science Churches shall consist only of _Science and Health with Key to the Scriptures_, by Mary Baker Eddy, and other writings by this author; also the literature published or sold by The Christian Science Publishing Society. [3] See also Article XXV, Sect. 7. RELATION AND DUTIES OF MEMBERS TO PASTOR EMERITUS Article XXII