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 it as applicable would have rendered it unconstitutional as impairing the obligation of contracts (Lander v. Deemy, N. D. 176 N. W. 922). This principle or rule of construction is necessarily involved here, since the taxes on national bank stock are affected. The power of the state to tax the stock in national banks is derivative. A national bank, being created by the federal government, may not be taxed on its franchise nor the stockholder taxed on his stock by the states, except as permitted by Congress. McCulloch v. Maryland, 4 Wheat. 316, 4 L. ed. 579; Osborn v Bank, 9 Wheat. 738, 6 L. ed. 204; Weston v. Charleston, 2 Pet. 449, 7 L. ed. 481; People of the State of New York v. Weaver, 100 U. S. 539, 25 L. ed. 705; Owensboro National Bank y. Owensboro, 173 U. S. 666, 19 Sup. Ct. 537, 43 L. ed. 850. Congress has given such consent by providing that the stock may be taxed to the stockholders subject to two restrictions, viz.:

“That the taxation shall not be at a greater rate than is assessed upon other moneyed capital in the hands of individual citizens of such state, and that the shares of any national banking association owned by nonresidents of any state shall be taxed in the city or town where the bank is located, and not elsewhere.” R. S. § 5219; U. S. Comp. St. § 9784.

Under this act of Congress national bank stock may not be taxed according to the local rate of levy while other moneyed capital invested in forms of securities generally denominated as credits is taxed in the same locality at a flat rate much less than the rate applicable to such national bank stock. Boyer v. Boyer, 113 U. S. 689, 5 Sup. Ct. 706, 28 L. ed. 1089; Evansville National Bank v. Britton, 105 U. S. 322, 26 L. ed. 1053; Merchants’ National Bank v. City of Richmond, 256 U. S. 635, 41 Sup. Ct. 619, 65 L. ed. 1135. Therefore, if it be assumed that the legislature intended to exclude stock of national banks, along with state banks, from the operation of the Money and Credits Act of 1917, and to continue taxing such stock at the local rate of levy, the statute would be unconstitutional as taxing the stock of national banks beyond the authority granted. Of course it cannot be contended that the legislature contemplated taxing national bank stock as a credit at 3 mills on the dollar and state bank stock at the local rate. The decisions of the United States Supreme Court are controlling upon the federal question presented by such tax legislation (Des Moines National Bank et al. v. City of Des Moines, 153 Iowa, 336, 133 N. W. 767), and it is the duty of state courts to so construe acts of the legislature, if possible,