The hearing given to a person accused of crime, by a magistrate or judge, exercis- ing the functions of a committing mag- istrate, to ascertain whether there is evi- dence to warrant and require the commit- ment and holding to bail of the person accused. See Bish. New Cr. L. § 32, 225- 239 a. Coroners generally have the powers of a committing magistrate as also have the mayors of cities in many of the states; id. 229 b. In case, as it often happens, there is question as to what precise crime should be charged against the prisoner or whether more than one crime is involved in the facts shown, the commitment should be so framed as to cover them all, leaving to the prosecuting officer and the grand jury the opportunity for election; but if the com- mitment does not cover all charges it does not discharge the prisoner from liability for the rest; id. § 33. The discharge of a prisoner on a preliminary examination will not operate as a bar to further proceedings; 47 N. J. L. 251; 16 Tex. App. 321; 10 Neb. 78. It is said that a person charged with crime, unless a fugitive from justice, is en- titled to a preliminary examination; 44 Neb. 417; but it was also held that such examination is not necessary as a basis for finding an indictment; 3 Pac. Rep. (Ida.) 272; and that in proper cases the court may direct the prosecuting attorney to submit indictments without such examina- tion; 2 Dist. Rep. Pa. 743. A complaint made on such examination may be dis- missed and a new charge prosecuted before another magistrate: 7 Wash. 506; but after holding the accused to bail the mag- istrate cannot discharge him without notice to the prosecutor; 160 Pa. 119. The denial of the right to be taken before a magistrate of the county in which one is arrested, to give bail does not vitiate a subsequent trial and conviction; 79 Hun 410. Where the evidence seems to warrant the commitment of the accused person, or time is required for the introduction of other evidence or for further investigation, the person may be committed or held to bail for further hearing. The examina- tion may be postponed on account of the physical inability to attend of important witnesses for the state; 47 La. Ann. 1677. Generally the offence charged is stated in the complaint and warrant and a pre- liminary examination is waived; and a plea that there was no such examination will not be entertained after information filed; 54 Kan. 206. An objection that there was no preliminary examination must be raised before trial by plea in abate- ment or motion to quash; 44 Neb. 417. A person arrested and taken before a magistrate for preliminary examination may waive it even where the state consti- tution secures the right to such examina- tion; 115 Cal. 57; 47 Pac. Rep. (Idaho) 945. See, also, 46 Neb. 631. See, also, as to waiver of such examinations, 83 Wis. 486; 103 Mich. 473: 25 Fla. 675; 45 Hun 34. It is the duty of the committing mag- istrate to secure the attendance of witnesses for the prosecution who are examined by him, for which purpose he may require them to give bail for their appearance be- fore the grand jury or in the criminal court, with or without surety which is usually in his discretion: 1 Bish. N. Cr. L. 34. Where the preliminary examination is provided for by law, the testimony of the witnesses taken thereat may be after- wards shown in contradiction; 85 Cal. 421; 17 Vt. 658; 34 La. Ann. 1037; 40 Ark. 454; see 2 Swan 237; 32 Ia. 36. And the witnesses are liable to the penalties of perjury for false swearing if so authorized, otherwise not; 40 La. Ann. 460; 26 Me. 69: 2 McClain, Cr. Law § 858. The filing of an information after the preliminary examination, but before a re- turn of it made by the examining magis- trate, is a mere irregularity and does not vitiate the proceedings; 115 Cal. 57. In Colorado, by statute, an information may be filed without a preliminary examina- tion, upon the affidavit of any person who has knowledge of the commission of the offence and is a competent witness; 23 Col. 1, 9. Where a complaint charged perjury on a certain date, and examination was waived, and the information subsequently filed charged the commission of the crime on another date, a plea in abatement on the ground that there was no examination on the offence charged in the information, was substained; 91 Wis. 245. A statutory requirement that the magis- trate shall, on preliminary examination, examine the witnesses to support the ac- cusation, does not require that all of the witnesses known to the state shall be ex- amined, but merely sufficient to justify the magistrate in binding over the accused for trial: 65 N. W. Rep. (Wis.) 848. United States commissioners holding preliminary examinations have no judicial power, but only authority to determine whether there is probable cause to believe that the offence was committed: 70 Fed. Rep. 972; and a district judge holding a preliminary examination has only, quoad hoc, the powers of a commissioner; id. Where an e