The State Auditor and Inspector must have had at least three years' experience as an expert accountant; his duties shall be, without notice to such treasurer, to examine the state and all county treasurers' books, accounts and cash on hand or in bank at least twice each year, and publish his report as to every such treasurer once each year. For the purpose of such examination he shall take complete possession of such treasurer's office. He shall also prescribe a uniform system of bookkeeping for the use of all treasurers. The State Auditor and Inspector shall perform such other duties and have such other powers as may be prescribed by law.