The lien herein provided for shall be subject to prior mortgage liens, unless the holder thereof has received notice of the intention of the threshing or combining of the grain or seed and consented thereto in writing, after which the holder of such mortgage lien shall become jointly liable with the owner of the grain or seed for the expenses of threshing or combining of the same.
Laws 1913, c. 38, p. 75, § 3; Laws 1935, p. 225, § 3.