(105 ILCS 5/15-12) (from Ch. 122, par. 15-12)
    Sec. 15-12. Conduct of sale.
    Upon the day of sale, the county superintendent shall make sales by beginning at the lowest numbered lot and proceeding regularly to the highest numbered until they are all sold or offered. No lot shall be sold for less than its valuation. The sale may continue from day to day. Each lot shall be sold separately and offered long enough to enable any person present to bid who so desires.
(Source: Laws 1961, p. 31.)