Sec [Section]1 Be it enacted by the people of the State of Illinois represented in the General Assembly; That the corporate authorities of the town of Princeton, in the county of Bureau is hereby authorized to extend the time of levying a tax upon real estate within the corporate limits of the town of Princeton for the term of two years beyond the time contemplated in the first section of the act to which this is an amendment, any thing in the said first section to the contrary notwithstanding.