Either party shall be entitled to a trial by jury, on demand made therefor at any time before the hearing, and the jury shall decide the facts under the charge of the judge. When a jury is demanded, the court shall order the sheriff to summon 12 men, or, by agreement of the parties, any less number, competent to serve as jurors; and the mode of swearing, impaneling, challenging, and supplying the places of jurors shall be the same, so far as practicable, as in the circuit court, on the trial of civil actions.