64. If a disagreement still subsists sixty days after the appointment of the mediator-arbitrator, the parties may, in common agreement, request the mediator-arbitrator to rule on the subject of the disagreement. If the mediator-arbitrator is then of opinion that a settlement is not likely to be reached by the parties, he shall rule on the question and inform the parties of his decision.
The decision of the mediator-arbitrator is deemed to be an agreement within the meaning of section 60.