What is the effect of a perjurer on the witness stand?

Now you can see this man's manner of testifying in the courtroom when he was on the witness stand. He had that hangdog look of a guilty man. He could not talk hardly above a whisper and he could not talk so the court could hear him. . . . If ever a man by his appearance and his manner of giving testimony has shown himself to be a willful, deliberate and outright perjurer as to material facts in a case, the defendant in this case has been it.

71 P.2d at 272.

In United States v. Meltzer, 7 Cir., 1938, 100 F.2d 739, the trial judge said to the jury: