The purported certificate of redemption issued by the County Treasurer is illegal and void. Black v. Lumber Co., 32 Wyo. 248; Blackwell on Tax Titles, 4th Ed. Chapter XXVII, p. 483; News Company v. Commissioners, 46 P.2d 568. Persons dealing with municipalities are charged with notice of the limitation of their authority. Anadarko Home v. Scarth, 46 P.2d 539; Western Paint Company v. Commissioners (Okla.)