Nevertheless, consideration has been given to the possibility that the arbitrators need not necessarily be jurists. It has therefore been decided that, when called upon to deal with points of law, they shall, if one of the parties so desires, request, through the medium of the Council, the advisory opinion of the Permanent Court of International Justice, which must, in such a case, meet with the utmost possible despatch. The opinion of the Court is obtained for the assistance of the arbitrators; it is not legally binding upon them, although its scientific authority must, in all cases, exercise a strong influence upon their judgment. With a view to preventing abusively frequent consultations of this kind, it is understood that the opinion of the Court in regard to disputed points of law can only be asked on a single occasion in the course of each case. {177} The extension which, in the new system of pacific settlement of disputes, has been given to the advisory procedure of the Court has suggested the idea that it might be desirable to examine whether, even in such cases, it might not be well to adopt the system of adding national judges which at present only obtains in litigious proceedings, and also that of applying to the advisory procedure the provisions of Article 24 of the Statute of the Court relating to withdrawal of judges. If the parties have not been able to come to an understanding on all or on some of the points necessary to enable the arbitration to be carried out, it lies with the Council to settle the unsettled points, with the exception of the formulation of the questions to be answered, which the arbitrators must seek in the claims set out by the parties or by one of them if the others make default. In cases where the selection of arbitrators thus falls upon the Council, it has appeared necessary--however much confidence may be felt in the Council's wisdom--to lay down for the selection of the arbitrators certain rules calculated to give the arbitration the necessary moral authority to ensure that it will in practice be respected. The first rule is that the Council shall, before proceeding to the selection of arbitrators, have regard to the wishes of the parties. It was suggested that this idea should be developed by conferring on the parties the right to indicate their preferences and to challenge a certain number of the arbitrators proposed by the Council.