In conveyane-lng. The act by whlch a party who has exe-cuted an instrument of conveyance as grantor goes before a competent officer or court, and declares or acknowledges the same as hls genuine and voluntary act and deed. The certificate of the officer on such Instrument that it has been so acknowledged. Rogers v. Pell, 154 N. T. 518, 49 N. E. 75; Strong v. United States (D. C.), 34 Fed. 17; Burbank v. Ellis, 7 Neb. 156