The state may also contract debts in anticipation of the receipt of the proceeds of the sale of bonds theretofore authorized, for the purpose and within the amounts of the bonds so authorized. Notes or obligations for the money so borrowed shall be issued as may be provided by law, and shall with the interest thereon be paid from the proceeds of the sale of such bonds within two years from the date of issue, except as to bonds issued or to be issued for any of the purposes authorized by article eighteen of this constitution, in which event the notes or obligations shall with the interest thereon be paid from the proceeds of the sale of such bonds within five years from the date of issue.