(70 ILCS 2605/4.1) (from Ch. 42, par. 323.1)
    Sec. 4.1.
    All offices and places of employment, other than the offices of sanitary district trustees and the offices enumerated in section 4.13 of this Act, in the sanitary district shall be classified and filled in the manner hereinafter provided for and not otherwise.
(Source: Laws 1935, p. 744.)