The considerations which, according to our decision in Reg. v. Commonwealth Court of Conciliation and Arbitration; Ex parte Ellis [1] , govern the administration of s. 46 of the Conciliation and Arbitration Act 1904-1952 are therefore in the main inapplicable. It is clear that if there be a duty on the part of the Chief Judge to hear the association he must hear the general secretary on the association's behalf: R. v. Board of Appeal; Ex parte Kay [1] . But s. 19, as has already been pointed out, is simply prohibitory, and the source of the duty must be sought elsewhere. Section 15C (1), (2) and (3), for all that appears in the statute, might be administered upon an ex parte application. But by S.R. No. 55 of 1952, regs. 67C and 67H were inserted in the Conciliation and Arbitration Regulations. They require that a copy of the application shall be served upon the parties who appeared or were represented before the Public Service Arbitrator, and that the registrar shall give notice of the time and place fixed by the Chief Judge for the hearing of the application to the persons upon whom a copy of the application has been served. The implication would seem to be that on the hearing of the application such persons are to be considered as parties and are entitled to be heard accordingly. If this is the effect of the regulations there is an end of the matter, for the prosecutor association was represented before the arbitrator in the proceedings out of which the pending application to the Chief Judge arose. But even if the Chief Judge had power to hear the application ex parte, it was at least his duty, when the association appeared before him by its general secretary and sought to oppose the application as an organization adversely affected by it, to decide in accordance with law, and not in accordance with an erroneous interpretation of s. 19, whether or not he would hear the proposed opposition. The transcript of the proceedings which took place before him shows that he allowed other organizations to appear by officers to oppose the application, and no doubt he would have allowed Mr. Smith to appear for the prosecutor association but for the view which he entertained as to the meaning of s. 19.