SEC. 4. When notice of the selection of a committee of arbitration by the other association shall be received, or as soon thereafter as practicable, and within the month of January, the two committees shall meet and proceed to organize themselves in a joint committee of arbitration by electing an umpire, who is neither a working mechanic nor an employer of mechanics. The umpire, when present, shall preside at meetings of the joint committee, and have the casting vote on all questions. SEC. 5. Seven members, exclusive of the umpire, shall constitute a quorum of the joint arbitration committee, and in case of the absence of any member, the chairman of his committee shall cast the vote for such absent members. A majority vote shall decide all questions. SEC. 6. The joint committee of arbitration shall have all evidence in complaints and grievances of a member or members of one body against a member or members of the other, or of one organization against the other, referred to it by the president of either association, and shall finally decide all questions submitted, and shall certify by the umpire such decisions to the respective organizations. Work shall go on continuously, and all parties interested shall be governed by award made, or decisions rendered, provided, however, that work may be stopped by the joint order of the presidents of the respective associations until the decision of the joint committee is had. SEC. 7. The joint committee shall have exclusive power to determine and fix definitely from year to year all working rules. It shall also have all exclusive authority to discuss and determine all other subjects in which both organizations, or members of both organizations, may be jointly interested and concerned, which may be brought before the committee by either organization or the president thereof. SEC. 8. Working rules are rules governing employers and workmen at work, such as the establishment of a minimum rate of wages to be paid practical bricklayers and stonemasons per hour, and of a uniform pay-day, to determine the number of hours to be worked per day, the time of starting and quitting work, the remuneration to be paid for work done overtime and Sundays, and other questions of like nature.