¶1delivered the opinion of the Court,
¶2On March 6 of this year, María Clemencia Espina filed in this Court a petition for mandamus, in which she asks us to order the Hon. José M. Calderón, Jr., Judge of the Superior Court, to decide case No. 2997 of the former Dis*73trict Court of Bayamón.
¶3Since the Rules of Civil Procedure are applicable to mandamus proceedings — see Rule 81 (a) and Martínez v. Morales, 72 P.R.R. 200—on that same day we issued a sum*74mons to the respondent, ordering him to appear to defend himself within the statutory period and apprising him that in default thereof judgment would be entered granting the relief prayed by the petitioner.
¶4The respondent Judge timely filed an extensive answer, specifically alleging therein that the writ prayed for does not lie because the petitioner has not moved for the consideration of the order of February 10, 1953, or that it be set aside in whole or in part; since there are available to the petitioner adequate remedies in the ordinary course of the law, such as appeal, certiorari, etc.; inasmuch as he was appointed District Judge of Bayamón on January 26, 1945, and held that position until the following June 15, when he ceased as such, the aforesaid case having been heard on the aforesaid date, but that it was not until June 7, 1945, that is, 8 days before he ceased as Judge of that court, that the case was submitted to him for decision; that sometime after ceasing as District Judge of Bayamón he was appointed Assistant Attorney General and Court Administrator, which position he held until May 8, 1947; and that on May 9 of that year he was appointed Judge of the District Court of San Juan, which position, by virtue of subsequent legislation, became at first Judge of the District Court of Puerto Rico and later, Judge of the Superior Court of Puerto Rico,
¶5The heirs moved to intervene. Similarly to the way *76respondent did, their motion was accompanied by an extensive writing in which they answered specifically each and every one of the allegations of the petition. We granted the intervention and ordered that the answer filed by the inter-vener remain in the record.
¶6The case was heard on June 4 of this year. The plaintiff submitted it on the memorandum and the documents attached thereto, while the respondent Judge, as well as the inter-vener’s attorney, appeared and argued orally.
¶7 It is true that we have often held that ordinarily mandamus does not lie unless petitioner alleges that he has made demand upon the respondent officer or body to act in the manner sought to be ordered—Suárez v. District Court, 65 P.R.R. 799 and cases cited at p. 806 — but it was unnecessary in this case to allege such demand in so many words, inasmuch as the contents of the petition clearly disclose that the respondent was requested to decide the case in question and that his refusal to do so was precisely what gave rise to the filing of the petition now before us. Nor was it necessary to move for the reconsideration of the order of refusal. Such action would have been idle, since the respondent was perfectly aware of what was intended and had repeatedly expressed himself in terms similar to those contained in his order.
¶8As already noted, inasmuch as .respondent ceased in his position as District Judge of Bayamón, he could not decide the case of filiation above mentioned. When he was appointed to the administrative position in the office of the Attorney General which he held until May 8, 1947, he could have decided the case if he had been appointed as Acting-Judge of the District Court of Bayamón and if it had submitted to him by stipulation of the parties. However, to decide the case under such conditions would have been discretionary on his part. Gilormini v. Heirs of Padilla, supra. When on May 9, 1947, he was designated Judge of the District Court of San Juan, his position concerning the *77aforesaid ease was similar to that existing when he was discharging the administrative position referred to, that is, since he was not the District Judge of- Bayamón, he could only decide it under the conditions stated. And when subsequently and by virtue of Act No. 432 of May 15, 1950, p. 1126, the Judiciary Act of Puerto Rico was approved and the territory of this Island was constituted -into a single judicial district, the respondent Judge had discretion, just as he now has, under Act No: 11 of the Judiciary of the Commonwealth of Puerto Rico of July 24, 1952 (Spec. Sess. Laws, p. 30), to likewise decide the aforesaid case but it was not his ministerial duty to do so. A contrario sensu, when he was discharging the aforesaid administrative position in the office of the Attorney General as well as when he subsequently discharged the positions of Judge of the District Court of San Juan, of Judge of the District Court of Puerto Rico, San Juan Section, and of Judge of the Superior Court of Puerto Rico, San Juan Part, he was under no ministerial duty whatsoever to decide the case in question. He was under such ministerial duty only when he was District Judge of Bayamón. And we know that the respondent ceased in that position on June 15, 1945. The respondent is at present, insofar as that case is concerned, in the same position as any other Superior Judge to whom the case might be submitted for decision on the record.
¶9As a general rule, the judge who has heard a case should be available to decide same. Cf. People v. Soto, 73 P.R.R. 52. No one is in a better position than he to decide it, since he has been able to observe the manner how the witnesses testify and has noticed their behavior in the' stand. Of course, in order that such manner of testifying and such behavior may be properly considered by the trier, it is always convenient and desirable that the cases be decided promptly.
¶10If after the respondent ceased as District Judge of Baya-món the petitioner was unable to have him decide the case —by an appointment as substitute judge and submitting the case by stipulation — she could have easily requested to have the case heard again by any other appointed judge.
¶11*79 Mandamus only lies to compel the fulfillment of a duty imposed by law, that is, a “ministerial” duty. People v. La Costa, Judge, 59 P.R.R. 178; Rodríguez v. García et al., 35 P.R.R. 350; Pagán v. Towner, 35 P.R.R. 1; People v. Arrillaga, supra; Pacheco v. Cuevas Zequeira, 27 P.R.R. 192. The respondent is at present, insofar as that case is concerned, under no duty imposed on him by law. Were he to decide that case, he would do so only in the exercise of his discretion, after the transcript of the evidence and the judgment roll were submitted to him, together with a stipulation of the parties requesting him to decide it. That would be, we repeat, a discretionary act on his part, and it is known that mandamus does not lie when the respondent has discretion to perform the act which he has been requested to perform. Rodríguez v. García et al., supra; Pacheco v. Cuevas Zequeira, supra.
¶12Furthermore, the writ prayed for only lies when the right of the petitioner is clear. Balasquide v. Luján 45 P.R.R. 548; Succrs. of A. Mayol & Co., Inc. v. MacLeod, 44 P.R.R. 32. In this case it is not.
¶13The petition is denied.
¶14 Case No. 2997, supra, is an action of filiation and is entitled Maria Clemencia Espina, etc., v. Heirs of Francisco Espina Rivera, composed of his widow Amelia Diaz and of his children Héctor Francisco, Elsa and Amelia Espina Diaz.
¶15 See Act No. 432 of May 15, 1950 (p. 1126) and Act No. 11 of June 24, 1952 (Spec. Sess. Laws, p. 30).
¶16 The order entered on February 10, 1953, by the respondent judge is set forth in the record and recites:
“The plaintiff filed a motion for reconsideration before the undersigned Judge, it being later explained that the said motion was intended to have the trier decide the case on its merits considering that he tried it in Bayamón while being Judge of that court. It is, therefore, a motion filed by the plaintiff and not a stipulation submitted by both parties.
“Counsel for the defendants object to the petitioner’s proposition to submit this ease on the stenographic record filed in the record and a copy of which has not been served on them.
“Both parties offered to file a memorandum in support of their respective contentions which they had not done to this date.
“As one of the parties does not consent to the case being submitted on the stenographic record, in accordance with Gilormini v. Heirs of Padilla,, 63 P.R.R. 580, we cannot decide it in harmony with plaintiff’s contention.
“In view of the foregoing reasons the request is overruled.”
¶17 Rule No. 10 oí the Rules of Administration for the Court of First Instance of the Commonwealth of Puerto Rico provides that:
*78“Except when a longer period is necessary because of the nature of the case or some extraordinary circumstance, all cases tried on the merits shall be decided within forty-five (45) days and all other judicial matters within fifteen (15) days from the date on which the matter was submitted to the Court.”
¶18 We say this because the petitioner alleged that the appointed Judge of the District Court of Bayamón refused to decide the case because the parties did not want to submit it to him by stipulation.
¶19 In answer to the respondent’s and the intervener’s contention that the petitioner herein could appeal from the order of February 10, 1953, we do not think that such order of refusal is appealable. See § 295 of the Code of Civil Procedure.
¶20On the other hand, we also add that the issuance of a writ of cer-tiorari is always discretionary.