If the owner or owners of any such lands, purchased by the commissioners as aforesaid, shall not redeem the same within the period aforesaid it shall thereafter be lawful for the commissioners to sell any such lands at public sale, and make a deed or deeds therefor to the purchaser or purchasers with like effect and in the same manner that unseated lands purchased by county commissioners are now by law authorized to be sold by them, and after such sale the lands shall thereafter be charged by the proper assessor in the name of such last purchaser or redeemer, and shall again be liable to be assessed and sold for taxes as other lands.