A person shall not build or erect any vault, tomb, headstone, monument, cross or railing, in any spot in the Cemetery the ownership of which has not been acquired, except by permission of the Cemetery Committee. Previously to any such monument or enclosure being set up on any spot in the Cemetery of which the ownership has been acquired a statement of the design and material of such monument or enclosure and of the terms of any inscription which it may be intended to affix thereto shall be submitted to the Cemetery Committee, and no work shall be commenced on such monument until the Committee has approved in writing of such design or inscription.