SEC. 9: The Board of Supervisors shall elect a Chairman, who shall preside at all meetings. In case of his absence or inability to act, the members present must, by an order entered of record, select one of their number to act as Chairman _pro tem_. Any member of the Board may administer oaths, when necessary in the performance of his official duties. A majority of the members shall constitute a quorum, and no act of the Board shall be valid or binding unless a majority of the members concur. ARTICLE III. _General Powers of the Board of Supervisors_ SEC. 10: The Board of Supervisors shall have all the jurisdiction and power which are now or which may hereafter be granted by the constitution and laws of the State of California or by this Charter. SEC. 11: It shall be the duty of the Board of Supervisors: (1) To appoint all county officers other than elective officers, and all officers, assistants, deputies, clerks, attachés and employees whose appointment is not provided for by this Charter. Except in the cases of appointees to the unclassified service, all appointments by the Board shall be from the eligible civil service list. The Board shall provide, by ordinance, for the compensation of elective officers and of its appointees, unless such compensation is otherwise fixed by this Charter. (2) To provide, by ordinance, for the number of Justices of the Peace and Constables, to be elected and appointed, respectively, in each Township. The Board may also provide, by ordinance, for the number and fix the compensation, of such other judges and inferior officers of such inferior courts as are now, or may hereafter be, provided by the constitution or by general law. (3) To provide, by ordinance, for the number of assistants, deputies, clerks, attachés and other persons to be employed from time to time in the several offices and institutions of the county, and for their compensation and the times at which they shall be appointed. (4) To provide, by ordinance, for the creation of offices other than those required by the constitution and laws of the State, and for the appointment of persons to fill the same, and to fix their compensation. (5) To require, if deemed expedient, any county or township officer, or employee, before or after entering upon the duties of his office, or service, to give bond for the faithful performance thereof, in such penal sum as may be fixed by the Board. (6) To provide, publish and enforce, a complete code of rules, not inconsistent with general laws or this Charter, prescribing in detail the duties, and the systems of office and institutional management, accounts and reports for each of the offices, institutions and departments of the county. ARTICLE IV. _County Officers Other Than Supervisors_ SEC. 12: The elective county officers other than members of the Board of Supervisors shall be: Sheriff, District Attorney and Assessor.