Section 12. The whole amount secured for the payment of an annuity, or other sum payable periodically for an ind

12. The whole amount secured for the payment of an annuity, or other sum payable periodically for an indefinite time, by a bond, promissory note, or mortgage-deed shall, for the purposes of this Act, be deemed to be ten times the amount of the payment calculated for one year. Where the consideration for a conveyance is an annuity or other sum payable periodically for an indefinite time, such consideration shall, for the purposes of this Act, be deemed to be ten times the amount of the payment calculated for one year.