Before service can be made by publication an affidavit must be filed in the action showing the cause to be one for the specific performance of a contract for the sale of real estate, and that the defendant to be served with process is a nonresident of the state, and it being shown to the satisfaction of the court that the defendant is in fact a nonresident, the court shall order service by publication. History: Laws 1933, ch. 9, § 3; 1941 Comp., § 25-1603; 1953 Comp., § 22-18-3.