From and after the first day of January, Anno Domini one thousand eight hundred and ninety-eight, whenever any unseated lands within this commonwealth shall, under existing laws, become liable to sale by the respective county treasurers or the county commissioners for nonpayment of taxes, it shall be the duty of such treasurers and commissioners to publish a notice once a week for six successive weeks in at least two newspapers of general circulation within the county in which the lands lie, and if two newspapers be not published in said county, then in one newspaper in or nearest to the same, which notice shall contain the names of the owners when known, the warrant numbers, names of warranties when known, the number of acres contained in each tract, the township in which the same is located, and the sums due upon each tract for taxes; and, further, to mail to the secretary of agriculture and the commissioner of forestry,¹ each, ten copies of such printed advertisement immediately upon the publication thereof.