3. When said church building is completed said Board shall elect a pastor, reader or speaker to fill the pulpit who shall be a genuine Christian Scientist; they shall maintain public worship in accordance with the doctrines of Christian Science in said church, and for this purpose they are fully empowered to make any and all necessary rules and regulations. 4. Said Board of Directors shall not suffer or allow any building to be erected upon said lot except a church building or edifice, nor shall they allow said church building or any part thereof to be used for any other purpose than for the ordinary and usual uses of a church. 5. Said Board of Directors shall not allow or permit in said church building any preaching or other religious services which shall not be consonant and in strict harmony with the doctrines and practice of Christian Science as taught and explained by Mary Baker G. Eddy in the seventy-first edition of her book entitled "SCIENCE AND HEALTH," which is soon to be issued, and in any subsequent edition thereof. 6. The congregation which shall worship in said church shall be styled "The First Church of Christ, Scientist." 7. Said Directors shall not sell or mortgage the land hereby conveyed; but they shall see that all taxes and legal assessments on said property are promptly paid. 8. Said church building shall not be removed from said lot except for the purpose of rebuilding thereon a more expensive or a more convenient structure in which said doctrines of Christian Science only shall be preached and practised. If said church building is removed for either of the purposes above set forth, any and all tablets and inscriptions which are or shall be upon said church building at the time of removal shall be removed therefrom and placed upon the walls of the new edifice. If said building is burned, the Directors shall forthwith proceed to rebuild the church. 9. Said Directors shall maintain regular preaching, reading or speaking in said church on each Sabbath, and an omission to have and maintain such preaching, reading or speaking for one year in succession shall be deemed a breach of this condition. 10. Whenever said Directors shall determine that it is inexpedient to maintain preaching, reading or speaking in said church in accordance with the terms of this deed, they are authorized and required to reconvey forthwith said lot of land with the building thereon to Mary Baker G. Eddy, her heirs and assigns forever by a proper deed of conveyance. 11. The omission or neglect on the part of said Directors to strictly comply with any of the conditions herein contained shall constitute a breach thereof, and the title hereby conveyed shall revert to the grantor Mary Baker G. Eddy, her heirs and assigns forever, upon her entry upon said land and taking possession thereof for such breach.