139.070. Any person who has a lien by mortgage or otherwise,upon any real property upon which the taxes have not been paid,may pay such taxes and the interest, penalty and costs thereon;and the receipt of the county collector shall constitute anadditional lien upon such land, to the amount therein stated; andthe amount so paid and the interest thereon at the rate specifiedin the mortgage or other instrument shall be collectible with, oras a part of, and in the same manner as the amount secured by theoriginal lien.
(RSMo 1939 ยง 11163)