" Wertz v. Barnard, 32 Okla. 426, 122 P. 649. See, also, McKelvy v. Choctaw Cotton Oil Co., 72 Okla. 74, 178 P. 882; Equels, Admx., v. Tulsa City Lines, Inc., 194 Okla. 79, 147 P.2d 460; Schofield v. City of Tulsa, 111 Okla. 220, 239 P. 236. Plaintiff next argues that the court erred in giving the following instruction: