And whereas the high contracting parties have, within the stipulated time, presented their invitation to the proposed umpire, which was accepted by him, and have, also, duly presented their invitation to the proposed umpire, which was accepted by him, and have, also, duly presented their respective memoirs, and the documents, titles, maps, quotations, references, and all the antecedents which they judge favorable to their rights, as provided in the sixth and eighth articles of said treaty: