Immediately upon receipt of the advice of final appraisement, the county treasurer shall proceed to sell the land described in the appraisement. The county treasurer shall give public notice in the official county paper once each week for two consecutive weeks previous to such sale that such land has been duly appraised, and that the county treasurer will offer the same at public sale on the day and hour named in the notice. The notice shall contain a description of the land and its appraised value. At the time mentioned in the notice, the county treasurer shall offer all of the school lands so appraised for sale at public auction, selling each legal subdivision separately and receiving bids by the acre, but no bid shall be received for less than the appraised value.