In praotioe. The cor-rection of an error committed in any pro-cess, pleading, or proceeding at law. or in eq-uity, and which is done either of course, or by the consent of parties, or upon motion to the court in which the proceeding is pend-ing. 3 Bl. Comm. 407, 448; 1 Tidd, Pr.. 696. Hardin v. Boyd, 113 U. S. 736, 5 Sup. CL 771, 28 L. Ed. 1141