Code of Organization and Civil Procedure (Cap. 12), article 572

572. A witness is bound to appear in court on the date and time prescribed in the subpoena provi ded that he is served with the said subpoena four days before such da te, which period is to run fro m the date of service of the subpoena: Provided further that it shall be lawful for the court, in urgent cases, to order any witness to appear from day to day, o r from hour to hour, or even only within such interval of time as may be necessary for him t o appear in court. Oath as to relevancy of evidence of witness outside the jurisdiction. Deposit of allowance.