delivered the opinion of the- court.
On May 22, 1922, appellant was arrested for a crime of assault and battery by virtue of a complaint filed before the Municipal Court of Fajardo. By affidavit filed by appellant in the District Court of Humac'ao it is. set up that the trial did not take place in the Municipal Court of Fajardo until September 22nd and, according to the same affidavit, that the appellant then presented a motion to the Municipal Court of Fajardo asking, inasmuch as his trial did not take place within 120 days after his arrest, for a dismissal by virtue of section 448 of the Code of Criminal Procedure and of Section 2 of the Organic Act, each looking to a speedy trial. None of the proceedings in regard to this motion to dismiss were certified up by the municipal court, and the appellant did not include any official certificate of these proceedings when subsequently on appeal he made a motion for dismissal in the District Court of Humacao because of a lack of. a speedy trial in the municipal court. Not even the date at which the trial took place in the munici*4pal court is certified to by any official of that court. The appellant relied on his affidavit alone.
When in 1916 the District Court of San Juan refused to dismiss a cause far lack of a speedy trial the proceedings of that court were brought before us by virtue of a writ of mandamus. Dyer v. Rossy, 23 P. R. R. 718. An appeal then could have availed the defendant, but he would first have had to submit' to trial. In the present case whatever rights the appellant may have had to revise the proceedings of the municipal court by virtue of mandamus, habeas corpus, or any other method, in the District Court of Humaeao, the fact is that after his motion to dismiss was overruled he went to trial, was- convicted, and then appealed. The question then arises whether on appeal to the district court the latter is authorized by virtue of the appeal to review the proceedings in the municipal court.
On appeal from a municipal court the trial is imperatively de novo. The district court acquires jurisdiction only to try the case de novo. It does not sit as a court of review and it cannot on appeal review an incident of the trial. Of course if it be alleged that the municipal court was without jurisdiction to try the case, a different matter is presented.
Furthermore, on appeal from the municipal court the original complaint is certified to the district Court and practically nothing else. No provision is made for. bringing any other matter before the district court.
When the motion to dismiss and the affidavit were presented to the district court the fiscal objected because the proceedings before the municipal court did not appear, including the failure to show the order of the Municipal Court of Fajardo or whether or not the municipal court postponed for just cause. Assuming the right to review in the district court, there would be a presumption that *5the municipal court found a just cause for postponing and the burden -would be on appellant to show otherwise. While we have held that on an application to dismiss the burden is on the fiscal to show a postponement for just cause, when a court postpones, as we have held, the presumption is in' favor of a just postponement and the defendant must make a showing; to the contrary.
The facts of this case were that the prosecuting, officer was in doubt whether he should not prosecute for an “attempt to kill.” The papers were sent to him on May 26th, 1922, for this purpose by either the committing magistrate or the municipal judge. On June 30th the fiscal told the municipal court to go ahead with the' trial. If we may discount the time that the fiscal was investigating the more serious charge, there would be no delay outside of 120 days.
The trial took place on September 22, 1922 — exactly four calendar months after the arrest. If the court had a right to discount even three days because of the action of the prosecuting officer, the trial was duly held. Other considerations might apply to show a just cause as pointed out in People v. Ibern, 31 P. R. R. 867.
The judgment must be
Affirmed.
Chief Justice Del Toro and Justices Aldrey, Hutchison and Franco Soto concurred.