This is a petition for a writ of mandamus. As the issues now stand the case relates to a recount of votes cast at the State election held on November 8, 1932, respectively for John J. Gilmartin, hereafter called the petitioner, and Louis N. M. DesChenes, who has been permitted to intervene and who will be hereafter called the intervenor. These two were rival candidates for election as one of the two representatives to the General Court from the Eleventh Worcester District, made up of certain wards in the city of Fitchburg and of the town of Lunenburg. The result of the original count of these votes showed that the intervenor was elected. On November 16, 1932, there *78was a recount of the ballots cast in the city of Fitchburg. The result of that recount, in combination with the votes cast in the town of Lunenburg which were not recounted, also showed that the intervenor was elected. Certificate of his election under date of November 8, 1932, was issued on November 17, 1932, signed among others by the city clerk. Another similar certificate was issued on or about December 20, 1932. The original of each certificate was sent to the Secretary of the Commonwealth and a copy was sent or delivered to the intervenor. The present petition was filed on November 18, 1932. Hearings were had on it before an auditor and before a single justice wherein certain facts have been found, based chiefly on comparison of the markings and erasures on certain ballots, to the effect that at some time before thirty-seven minutes past five o’clock in the forenoon of the day following the election certain crosses were made, after the ballots had been deposited, on some of the ballots by a person other than the voters who marked and deposited the ballots and that these crosses were made for the purpose of aiding by fraud in procuring for the intervenor election to the office of representative in the General Court; and that enough ballots were so marked to change the result of the election, according to the findings made, and to show that the petitioner and not the intervenor was elected as representative to the General Court.
On January 10, 1933, final findings of fact were made and the case was reserved upon the facts found for determination by the full court. It came on for argument before us on February 7, 1933.
In the meantime the General Court convened on January 4, 1933. By reason of the notoriety attaching to events of such public interest, it has become matter of general knowledge, of which the court take cognizance, that the certificate issued showing the election of the intervenor has been presented to the House of Representatives (G. L. [Ter. Ed.] c. 3, §§ 1, 2; c. 54, §§ 128,129,135), and that the petitioner has taken action to contest the election of the intervenor, that before a committee of the House of Reprer *79sentatives hearings have been held, witnesses have testified and arguments have been made, and that the subject is now being considered by the committee.
It is provided by the Constitution of the Commonwealth, c. 1, § 3, art. 10: “The house of representatives shall be the judge of the returns, elections, and qualifications of its own members, as pointed out in the constitution . . . .” It is also provided by c. 1, § 3, art. 11: “And the senate and house of representatives may try, and determine, all cases where their rights and privileges are concerned, and which, by the constitution, they have authority to try and determine, by committees of their own members, or in such other way as they may respectively think best.” Jurisdiction to pass upon the election and qualification of its own members is thus vested exclusively in the House of Representatives. “No other department of the government has any authority under the Constitution to adjudicate upon that subject. The grant of power is comprehensive, full and complete. It is necessarily exclusive, for the Constitution contains no words permitting either branch of the Legislature to delegate or share that power. It must remain where the sovereign authority of the State has placed it.” Dinan v. Swig, 223 Mass. 516, 517. The House of Representatives is “thus made the final and exclusive judge of all questions, whether of law or of fact, respecting such elections, returns or qualifications, so far as they are involved in the determination of the right of any person to be a member thereof.” Peabody v. School Committee of Boston, 115 Mass. 383, 384.
It is manifest from the facts already stated that the-House of Representatives is exercising its jurisdiction over the entire subject of the returns, election and qualification of the member entitled to sit for the Eleventh Worcester District as between the petitioner and the intervenor as rival claimants, and that it is proceeding to a final determination of that subject.
The petitioner contends that this court should nevertheless order that the respondents, the registrars of voters, count the ballots in conformity to the facts as found on this *80record, that certificate be issued in accordance with such recount, and that the intervenor surrender the certificate of election previously issued to him. This contention cannot be supported. The certificate to the effect that the intervenor has been elected was seasonably issued, presented to the House of Representatives, and has served its purpose in connection with the contest by the petitioner of directing the attention of the House of Representatives to the question whether the intervenor is entitled to be declared a representative. The case at bar is distinguishable from Madden v. Election Commissioners of Boston, 251 Mass. 95. In that ease the respondents had done the utterly futile act of issuing a certificate to the effect that a man, who to the general knowledge of everybody concerned had died before the day of election, had been elected. Such certificate was an absolute nullity as matter of law. It was the ministerial duty of the respondents to issue a certificate that that petitioner on indisputable facts had been elected. The court ordered the respondents to perform that ministerial duty. In so doing, however, it was carefully pointed out that the adjudication did “not trench in any degree upon the constitutional prerogative vested exclusively in the House of Representatives ” by the article in the Constitution already quoted. The case at bar also is distinguishable from Swift v. Registrars of Voters of Quincy, 281 Mass. 271, and the numerous cases there reviewed for reasons too plain to require discussion.
It is unnecessary to determine questions raised by the petitioner as to the regularity of the issuance of the certificate to the intervenor. That and all cognate matters at this stage have come within the jurisdiction of the House of Representatives. The decision of such questions has become moot so far as this court is concerned and therefore any decision would be nugatory or unavailing. Sullivan v. Secretary of the Commonwealth, 233 Mass. 543. It is not necessary to consider other questions which have been argued. The result is that the order must be
Petition dismissed.