Section 95. General Auditing Office—City Auditor.— The City Auditor, under the supervision of the Auditor General, shall receive and audit all accounts of the city, in accordance with the provision of law relating to government accounts and accounting. He shall be appointment by the Auditor General and shall receive a salary provided for under existing laws, fifty per centum of which shall be payable from the funds of the city and fifty per centum shall be payable from the funds of the National Government.