The Constitution of the Democratic Socialist Republic of Sri Lanka 50. Whenever a Minister of the Cabinet of Ministers, other Minister or Deputy Minister is unable to discharge the functions of his office, the President may appoint any Member of Parliament to act in place of the said Minister of the Cabinet of Ministers, other Minister or Deputy Minister. 51. (1) (a) There shall be a Secretary to the Prime Minister who shall be appointed by the President. (b) The Secretary to the Prime Minister shall have charge of the Office of the Prime Minister and shall perform and discharge the duties and functions of his office, subject to the directions of the Prime Minister. Acting Minister and acting Deputy Minister Secretary to the Prime Minister and Secretary to the Cabinet of Ministers (2) There shall be a Secretary to the Cabinet of Ministers who shall be appointed by the President. The Secretary shall, subject to the direction of the President, have charge of the Office of the Cabinet of Ministers, and shall discharge and perform such other functions and duties as may be assigned to him by the President or the Cabinet of Ministers. 52. (1) There shall be for each Ministry a Secretary who shall be appointed by the President. (2) The Secretary to the Ministry shall, subject to the direction and control of his Minister, exercise supervision over the departments of Government or other institutions in the charge of his Minister. (3) The Secretary to a Ministry shall cease to hold office upon the dissolution of the Cabinet of Ministers under the provisions of the Constitution or upon a determination by the President under Article 44 or Article 45 which results in such Ministry ceasing to exist. (4) Where the Secretary to a Ministry so ceases to hold office, the Cabinet of Ministers may appoint such Secretary to any other post in the Public Service: Provided that a person who immediately prior to his appointment as Secretary was in the Public or Local Government Service or in the service of any public corporation shall be deemed to have been temporarily released from such 41 Secretaries to Ministries