Any such acquisition of lands or shares shall be subject to all vested rights of individual owners of the lots or allotted burial spaces in any such cemetery to continue lawful use thereof for burial purposes and to have the graves, burial vaults, gravestones and markers and monuments therein remain inviolate, subject to the right and power of the city to preserve, care for and reasonably keep the same without disturbing the remains of the dead therein interred; provided, that when and after the continuing or making of new or additional interments in any such cemetery may become detrimental or a menace to the health and safety of the inhabitants of said city residing or carrying on business or industry at places adjoining or near to such cemetery, the city may, by ordinance, declare further interments in any such cemetery to be a public nuisance and prohibit further interments therein; provided further, that upon and after any such acquisition no further or additional grants, sales or gifts of lots or burial spaces or burial rights or privileges in any such cemetery or adjoining or connected lands of such cemetery corporation or association shall be made; and new or additional burials therein shall neither be promoted or encouraged.