2. The supreme court is a court of last resort in all matters which legally come before it; and whenever a court possesses the power to decide without appeal or other examination whatever, a subject matter submitted to it, it is a court of last resort; but this is not to be understood as preventing an examination into its jurisdiction, or excess of authority, for then the judgment of a superior does not try and decide so much whether the point decided has been so done according to law, as to try the authority of the inferior court.