by John Marshall Harlan, Sparf v. United States — Opinion of the Court
“ Indeed, if a jury may rightfully disregard the direction of the court in matter of law, and determine for themselves what the law is in the particular case before them, it is difficult to perceive any legal ground upon which a verdict of conviction can be set aside by the court as being against law. If it be the function of the jury to decide the law as well the facts,-if the function of the court be only advisory as to the law,-why should the court interfere for the protection of the accused against what it deems an error of the jury in matter of law? ”
