Miss. Code Ann. § 31-19-31

Any bonds hereafter issued to the United States of America to finance in part the construction, erection, or equipment of any state hospital of the State of Mississippi, or any series, class, or installment of such bonds may bear interest at such rate or rates of interest not exceeding four per centum (4%) per annum and may be subject to such terms of redemption with or without premium as the commission or officials authorized to issue such bonds may determine, notwithstanding that such bonds may be part of a series, class, or installment of bonds bearing a greater or less rate of interest, and notwithstanding that such bonds may be a part of any series, class, or installment containing other and different terms of redemption.