The final address made by a judge to the jury trying a case, before they make up their verdict, in which he sums up the case, and instructs the jury as to the rules of law which apply to its various issues, and which they must observe, in deciding upon their verdict, when they shall have determined the controverted matters of fact. The term also applies to the address of the court to a grand jury, in which the latter are instructed as to their duties.