Excepting the officers, boards, commissions, and departments hereinbefore specially mentioned and provided for, the Council shall have power to establish, create, combine or abolish offices, boards, departments or divisions when in its opinion the proper administration of the business of the City so requires; provided that all other administrative departments in existence January 1, 1916, shall continue until otherwise provided by the Council, and all administrative boards in charge of any administrative department of the City shall continue in office, and their successors shall be appointed as heretofore, excepting as other provision is made in this Charter, or may hereafter be made by the Council.