¶1This is an appeal from an order sustaining a demurrer to a petition for a writ of prohibition.
¶2Appellant sets out in his petition that after three successive criminal proceedings had been instituted in the police court of the city and county of San Francisco, in each of which appellant was charged with the crime of assault with a deadly weapon upon one Barney Ward, and after one of these proceedings had been dismissed by the judge of the police court and the two others had each successively culminated in an order of the superior court granting appellant’s motion to dismiss the information in the same, and after the grand jury had investigated and ignored a charge against appellant of this same offense, a fourth complaint has been filed against him on this same charge in the said police court, and that unless restrained from so doing Judge Conlan will proceed with a preliminary examination of such complaint. The petition also states that the respondent declared in open court that his mind was so fully *455made up in relation to the charge set forth in the complaint that he felt disqualified to act upon said charge.
¶3It is contended by appellant that respondent is disqualified for the reason that he has a fixed opinion as to the merits of the case and intends to hold him to answer. The fact that a judge of the police court has formed and expressed an opinion as to the merits of the matter that he is to determine does not disqualify him to hear and determine such matter. A judge is disqualified to act as such in an action or proceeding only: 1. When he is a party to or interested in the action or proceeding pending; 2. When he is related to either party or to his attorney or agent within the third degree; 3. When he has been an attorney in the action or proceeding; or, 4. "When it appears from affidavits that either party cannot have a fair trial before any judge of a court of record by reason of the bias and prejudice of such judge. “These are the only causes which work a disqualification of a judicial officer.” (McCauley v. Weller, 12 Cal. 524; In re Jones, 103 Cal. 397; Code Civ. Proc., sec. 170, as amended in 1897.)
¶4Appellant’s petition fails to disclose any of the foregoing causes of disqualification.
¶5The dismissals of the various charges against appellant constituted no bar to a further prosecution against him. (Pen. Code, secs. 999, 1387; Ex parte Clarke, 54 Cal. 415.) The police judge, therefore, had jurisdiction of the last proceeding before him. The office of the writ of prohibition is to restrain a judicial officer or other person from doing that which he has no jurisdiction to do; and, it appearing that Judge Conlan had the power as judge of the police court to hear and determine the matter before him, the demurrer to the petition was properly sustained by the superior court.
¶6We therefore advise that the order appealed from be affirmed.
¶7Pringle, C., and Britt, C., concurred.
¶8For the reasons given in the foregoing opinion the order appealed from is affirmed.
¶9Garoutte, J., Harrison, J., Van Dyke, J.