"If the judge presiding at the trial of an indictment of murder is of opinion that the evidence discloses no matter capable of forming provocation, or that the matter alleged by the prisoner as provocation is not capable of doing so, it is, of course, proper for him to direct the jury to that effect. But, under the code as at common law, it remains within the power of the jury to find a verdict of manslaughter, even although it means disregarding the direction. To tell the jury that they have not such a power is to state what is not correct in law and a prisoner is entitled to complain in a Court of Criminal Appeal of such a direction. There is all the difference between such a direction and a direction that the evidence given upon a trial for murder does not support a verdict of manslaughter. If a judge is of opinion that because such a verdict implies findings of fact that are not reasonably open the jury ought not to return it, he may so direct them without necessarily usurping the functions of the jury, and, if his opinion is correct in law, the verdict may stand. Lawyers have no difficulty in apprehending the distinction between, on the one hand, the impropriety of finding without evidence facts amounting to manslaughter, and, on the other hand, the existence of a right to return a verdict of manslaughter although it be a wrong verdict. But it is easy to believe that a jury would not make the distinction and would treat a direction that they ought not to find manslaughter as meaning that they had not power to do so, unless it was very clearly expressed. Yet the jury must not be led to understand that to find a verdict of manslaughter is actually beyond their power. Further, upon the question whether a finding of manslaughter on the ground of provocation would in a given case be unreasonable, the ruling of the House of Lords in Woolmington's Case[18] has, of course, an important bearing. For it may be open to entertain a reasonable doubt of provocation although it would be unreasonable to find affirmatively that provocation existed and was sufficient. These are all considerations showing the need of caution before a judge undertakes to direct a jury against finding manslaughter."