Any person making an arrest may orally summon as many persons as he deems necessary to aid him therein. NOTE: Section 20.25 is identical to former § 839. See also former §§ 723 and 727;Cal. Pen. Code § 839. See generally B. Witkin, California Criminal Procedure Proceedings Before Trial § 123 (Supp. 1973) (citizen's arrest may be effected by directing officer to make arrest on citizen's behalf). Section 838 which authorized a magistrate to order a peace officer or private person to arrest a person committing an offense in the presence of the magistrate is not continued. The section basically duplicated the much broader authority granted under § 20.25.