Sec.[Section] 1. Be it enacted by the people of the State of Illinois represented in the General Assembly That on the 1^st monday in August next, then shall be elected in the county of Henderson one county Commissioner for said county in addition to the number already provided to be elected by the act entitled an act creating the county of Henderson approved January 1841. who shall hold his office for one year from and after the 1^st monday in August next, as aforesaid, and thereafter elections for county Commissioners, shall be held[,] notice given[,] and returns thereof made in the same manner as now required by law