149. The president, a vice-president or any member called upon to hear a matter pursuant to the second paragraph of section 145 or to section 147 or 148 may, as regards oral testimony, and with the consent of the parties, rely on the notes and minutes of the hearing or on the stenographer’s notes or the recording of the hearing, if any. If the vice-president or member finds them insufficient, he may recall a witness or require any other evidence.