"Section 1686.    Additional counsel to assist fiscal. — The Secretary of Justice may appoint any lawyer in the government service, or a competent person but not in the public service, temporarily to assist a fiscal or prosecuting attorney in the discharge of his duties, and with the same authority therein as might be exercised by the Solicitor General: Provided, That if the person to be appointed in the public service is outside the jurisdiction of the Department of Justice, such appointment may only be made with the consent of the department head concerned."

"In addition to travel expenses, such appointee, if not in the government service, shall receive such compensation as shall be stipulated for, not exceeding thirty pesos per day for the time employed."