=27. The Quorum of the Twelve Apostles.=--Twelve men holding the apostleship, properly organized, constitute the quorum of the Apostles. These the Lord has designated as the twelve traveling counselors;[650] they form the traveling presiding High Council, to officiate under the direction of the First Presidency in all parts of the world. They constitute a quorum, whose unanimous decisions are equally binding in power and authority with those of the First Presidency of the Church.[651] When the quorum of the First Presidency is disorganized through the death or disability of the President, the directing authority in government reverts at once to the quorum of the Twelve Apostles, by whom the nomination to the Presidency is made. There may be apostles in the Church who are not members of this quorum of Twelve; but such have no place in the sittings of the quorum. [650] Doc. and Cov. cvii, 23, 33. [651] Doc. and Cov. cvii, 24. =28. The Presiding Quorum of Seventy.=--The first quorum of Seventies form a body whose unanimous decisions are equally binding with those of the Twelve Apostles. Many quorums of Seventies may be required in the work of the Church; already there have been effected approximately two hundred of such organizations; each quorum is presided over by seven presidents. The seven presidents of the First Quorum of Seventies, however, preside over all the other quorums and their presidents.[652] [652] Doc. and Cov. cvii, 25-26, 34, 93-97. =29. The Presiding Bishopric=, as at present constituted, comprises the Presiding Bishop of the Church, and two Counselors. This quorum holds jurisdiction over the duties of other Bishops in the Church, and of all organizations pertaining to the Aaronic Priesthood. The oldest living representative among the sons of Aaron is entitled to this office of presidency, provided he be in all respects worthy and qualified; he must be designated and ordained by the First Presidency of the Church.[653] If such a literal descendant of Aaron be found and ordained, he may act without counselors, except when he sits in judgment in a trial of one of the presidents of the High Priesthood, in which case he is to be assisted by twelve High Priests.[654] But in the absence of any direct descendant of Aaron properly qualified, a High Priest of the Melchizedek Priesthood may be called and set apart by the First Presidency of the Church to the office of Presiding Bishop; he is to be assisted by two other High Priests properly ordained as his counselors.[655] [653] Doc. and Cov. lxviii, 18-20. [654] Doc. and Cov. cvii, 82-83. [655] Doc. and Cov. lxviii, 19.