622.72  Expert witnesses — fee.
  Witnesses called to testify only to an opinion founded on special study or experience in any branch of science, or to make scientific or professional examinations and state the result thereof, shall receive additional compensation, to be fixed by the court, with reference to the value of the time employed and the degree of learning or skill required; but such additional compensation shall not exceed one hundred fifty dollars per day while so employed.
[C73, §3814; C97, §4661; C24, 27, 31, 35, 39, §11329; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §622.72]

Superintendent of state hospital, §226.5