Upon the adoption by the County Commissioners of a resolution declaring the necessity therefor, or whenever twenty percent (20%) of the qualified voters of any county of this state, as determined by the last previous General Election, shall petition the Board of County Commissioners of such county to call an election for the purpose of issuing bonds to purchase sites, erect and construct county hospitals, including alterations, additions to and enlargement of existing hospital buildings, it shall be the duty of said County Commissioners to call an election and give notice thereof in two (2) daily or weekly newspapers of general circulation published at the County Seat of the county; provided, that if there be one daily or weekly newspaper published in such county, in that event one shall be sufficient, and such notices shall be published for four consecutive weeks. If there is no daily or weekly newspaper published in such county, then printed notices shall be posted in one of the most public places in each voting precinct of the county at least thirty (30) days prior to said election. Said petition calling for said election shall name the amount of bonds to be issued and shall state the time of holding said election, which shall not be less than thirty (30) days from the first publication of any notice or the posting of said notice, and shall state for what purposes the hospital is to be used.