15. After voting, an elector shall insert his ballot paper in the envelope designed to contain it and bearing, in accordance with section 69 of the Professional Code (chapter C-26), the words “BALLOT PAPER — PRESIDENT” and the name of the Order. He shall seal that envelope and insert it in the stamped envelope addressed to the secretary that he shall then seal. He shall sign in the space reserved for that purpose on the envelope addressed to the secretary and send the envelope to the secretary before the closing of the poll.