(_a_) against a conviction on any ground of appeal which involves a question of law alone, and (_b_) with the leave of the Court of Criminal Appeal or upon the certificate of the Judge who tried him that it is a fit case for appeal against his conviction on any ground of appeal which involves a question of fact alone, or a question of mixed law and fact, or any other ground which appears to the court to be a sufficient ground of appeal, and (_c_) with the leave of the Court of Criminal Appeal against the sentence passed on his conviction unless the sentence is one fixed by law. =4.= (1) The Court of Criminal Appeal on any such appeal against conviction shall allow the appeal if they think that the verdict of the jury should be set aside on the ground that it is unreasonable or cannot be supported having regard to the evidence, or that the judgment of the court before whom the appellant was convicted should be set aside on the ground of a wrong decision of any question of law, or that on any ground there was a miscarriage of justice, and in any other case shall dismiss the appeal. Provided that the court may, notwithstanding that they are of opinion that the point raised in the appeal might be decided in favour of the appellant, dismiss the appeal if they consider that no substantial miscarriage of justice has occurred. (2) Subject to the special provisions of this Act, the Court of Criminal Appeal shall, if they allow an appeal against conviction, quash the conviction and direct a judgment and verdict of acquittal to be entered. (3) On an appeal against sentence the Court of Criminal Appeal shall, if they think that a different sentence should have been passed, quash the sentence passed at the trial, and pass such other sentence warranted in law by the verdict (whether more or less severe) in substitution therefor as they think ought to have been passed, and in any other case shall dismiss the appeal. =5.= (1) If it appears to the Court of Criminal Appeal that an appellant, though not properly convicted on some count or part of the indictment, has been properly convicted on some other count or part of the indictment, the court may either affirm the sentence passed on the appellant at the trial, or pass such sentence in substitution therefor as they think proper, and as may be warranted in law by the verdict on the count or part of the indictment on which the court consider that the appellant has been properly convicted.