The board of supervisors of each county shall provide and have placed in the courtroom of the courthouse a suitable bookcase, with doors and lock, of sufficient capacity to hold not less than two hundred law books, in which the Mississippi reports, digests thereof, statutes of the state, and other books belonging or furnished to the county, shall be kept, The board of supervisors shall purchase any volume of said reports, digests and statutes which may be lost or destroyed, and shall have bound all of such books as need to be rebound for preservation, all of which shall be paid for out of the county treasury. Additional bookcases shall be furnished when necessary.