In Sanders v. Walden, 214 Ark. 523, 217 S.W.2d 357 (1949), the supreme court discussed the circumstances under which an automobile owner will be found liable for negligent entrustment: "If the person permitted to operate the car is known to be incompetent and incapable of properly running it, although not a child, the owner will be held accountable for the damage done, because his negligence in entrusting the car to an incompetent person is deemed to be the proximate cause of the damage. In such a case of mere permissive use, the liability of the owner would rest, not alone upon the fact of ownership, but upon the combined negligence of the owner in entrusting the machine to an incompetent drive, and of the driver in its operation."