In general, the exertion of power; the process of operating or mode of action; au effect brought about in accordance with a definite plan. See Little Rock v. Parish, 3G Ark. 100; Fleming Oil Co. v. South Peun Oil Co., 37 W. Va. 053, 17 S. E. 203. In surgical practice, the term is of indefinite import, but may be approximately defined as an act or succession of acts performed upon the body of a patient, for his relief or restoration to normal conditions, either by mauipulation or the use of surgical instruments or both, as distinguished from therapeutic treatment by the administration of drugs or other remedial agencies. See Akridge v. Noble, 114 Ga. 940, 41 S. E. 78.