In Priest v. Arcos Enterprises Pty. Ltd. [2] , however, it was held that the fact that a plaintiff has given evidence of the cause of a happening which resulted in injury to him prevents him from asking the tribunal of fact, in the event that it does not accept that evidence, to infer negligence from the fact that the happening occurred although that inference is one which would have been open if he had given no explanatory evidence. Herron C.J., with whom the other members of the Court agreed, expressed the view that to allow him to rely upon such an inference would be "opposed not only to the true concept of res ipsa loquitur" but "against the authorities" [3] . For this his Honour cited Mummery's Case [4] and several earlier cases in the Supreme Court, and went on to say: "The situation is that the plaintiff cannot, as it were, have the best of both worlds. He cannot rely upon the rule of res ipsa loquitur and at the same time adduce evidence of the cause of the accident. If he does then the doctrine of res ipsa loquitur will have no place in the case. The res ceases to speak and the jury is to decide the case on the affirmative evidence" [5] . With all respect to the learned Chief Justice, I am of opinion that he fell into error in thinking that this was laid down in Mummery's Case [4] . Nor do the other cases which he mentioned seem to me to lend support to the proposition. These were Turner v. Commissioner for Road Transport and Tramways [6] ; Hayes v. Griffith District Hospital [7] ; and Jockel v. Jockel [8] . In Turner's Case [6] it was proved that a bus being driven along a public street suddenly swerved to one side and struck an awning erected over the footpath. For the defendant evidence was given that the happening was due to the fact that a boy had run in front of the bus and the driver had swerved to avoid him. The trial judge thought that it was unnecessary to decide whether this had in fact happened. The prima facie case of negligence arising on the plaintiff's case was, he considered, rebutted if the explanation given by the defence might have been true. On appeal it was held that this was not enough. Maxwell J., with whom Dwyer J. agreed, said: "If that explanation for the cause of the swerve is not accepted because the Judge was not satisfied that it was so in fact, the cause of the swerve is completely unexplained. The presumption of negligence is not rebutted" [1] . To the same effect, I think, were the reasons which I gave for holding that the trial judge had fallen into error. That was, of course, a case in which the defendant had offered the evidence as to the cause of the accident but what the Court held was that, unless the driver's explanation was accepted, an inference of negligence arising from the happening of the accident might still be drawn. The position would have been no different if the unacceptable explanation had come from the plaintiff and not from the defendant. In either case, the Court would have been left with an unexplained happening such as would not usually occur unless there had been negligence on the part of the defendant. Hayes v. Griffith District Hospital [2] , the next authority to which the learned Chief Justice referred, was a case in which the plaintiff was injured when a heavy blind hanging on the outside wall of a hospital ward fell on her. No evidence was offered by either party to explain why it fell and the sole question was whether the mere fact that it did fall afforded evidence of negligence on the part of the hospital authorities. It was held, by a majority of the Court, that it did and the decision seems to me, with respect, to have had no bearing upon the question with which the Court was concerned in Priest's Case [3] . Finally his Honour referred to Jockel's Case [4] . There, as Sugerman J. said, the undisputed facts were that the plaintiff was injured when the defendant's car, in which she was a passenger, came down a hill on the wrong side of the road at a speed of 40-50 miles an hour, not on the formed portion of the road but on the dirt shoulder, with the engine "roaring" and the car apparently out of control. It collided with a post on the side of the road, veered across the road and there collided with another car. The evidence for the defendant was that this had occurred because the foot brakes had suddenly and unexpectedly failed and the car had got out of control. The jury found for the defendant. It was not a case which at the trial was claimed to be one in which res ipsa loquitur. The plaintiff's case was that the defendant's car, travelling at a high speed on the wrong side of the road, had struck a post and then another car and each of these allegations was proved or conceded. The only issue in the case was whether or not, as the defendant had said, the brakes had failed and the question with which the Court was concerned was whether the trial judge had correctly directed the jury as to the onus of proof. The case certainly cannot be regarded as laying down, where a plaintiff has led evidence which is not accepted as to the cause of an accident, that an inference of negligence cannot be drawn, in an appropriate case, from the fact that the accident happened. The Court was not directing its mind to such a question.