In practice. The investigation and determination of a matter or matters of difference between contending par-ties, by one or more unofficial persons, chos-en by the parties, and called “arbitrators.” or “referees.” Duren v. Getcbell, 55 Me. 241; Henderson v. Beaton', 52 Tex. 43; Boy-den v. Lamb, 152 Mass. 416, 25 N. E. 609; In re Curtis-Castle Arbitration, 64 Conn. 501. 30 Atl. 769, 42 Am. St. Rep. 200