It shall be the duty of the probation officer to perform any and all duties required of him by the aforementioned judges of such counties in the supervision, care, investigation, and rehabilitation of persons whose sentences are suspended by the judges of the courts of record of the county; and upon order of a district judge of such county he shall investigate any matter pending before said judge and report to him in the manner prescribed by said judge.
Laws 1939, p. 228, § 3; Laws 1941, p. 19, § 1.