he clause written at the foot of an affidavit, stating when, where, and be- fore whom such affidavit was sworn. See U. S. v. McDermott. 140 U. S. 151, 11 Sup. Ct. 740, 35 L. Ed. 391; U. S. v. Julian, 102 U. S. 324. 16 Sup. Ct 801, 40 L. Ed. 984; Lutz v. Kinney, 23 Nev. 279, 46 Pac. 257.