have such full power to subpoena witnesses and require the production of documentary evidence and to administer oaths to witnesses as is possessed by Courts of Fir st Instance in criminal actions and may invoke the summary process of such courts for the punishment of contempts in failure, except for good reasons, to appear or to produce documentary evidence or to give testimony. All interpreters acting in any such pr oceeding shall be sworn well and truly to interpret between the counsel, the witnesses, and the person so designated, and the stenographers shall be sworn to make a true transcript of the testimony given on such proceeding. aTADCE 

(p) Parole of prisoners. — To authorize and direct, subject to the approval of the Governor-General, the discharge from custody, whenever he thinks best, of any person convicted of crime in any court within the Department of Mindanao and Sulu and suspend the sentence of such convict without granting a pardon, and prescribe the terms upon which a convict so paroled shall have his sentence suspended. Upon the failure of any convict to observe the conditions of his parole, to be determined by the department go vernor, the latter shall have authority to direct the arrest and return of such convict to custody, and thereupon said convict shall be required to carry out the sentence of the court as though no parole had been granted him, the time between the parole an d subsequent arrest not being taken as a part of the term of his sentence in computing the period of his confinement. 

( q ) Condemnation proceedings . — To determine for and in behalf of the government of the Department of Mindanao and Sulu and of any political subdivision thereof when it is necessary or advantageous to exercise the right of eminent domain. He may, in his di scretion, direct the department attorney to cause condemnation proceedings to be begun in the court having jurisdiction. The right of condemnation or eminent domain herein granted shall otherwise be exercised in accordance with general laws at the time bei ng in force. 

( r ) Harbor lines, wharves, and so forth . — To establish by executive order harbor lines in the department beyond which no piers, wharves, bulkheads, or other works shall be extended or deposits made, except under such regulations as he may prescribe from tim e to time, and to control and regulate the use of, or to operate, all piers, wharves, bulkheads, and other like improvements together with their arrastre plants and other equipment for the public service. THaAEC 

