Sec[Section] 1 Be it enacted by the people of the State of Illinois represented in the General Assembly That the Board of Commissioners of Public works be and they are hereby authorised and required to make or cause to be made true and faithfull estimates of all the work done upon any and all the Rail Roads and other public works in this State upon which contracts have heretofore been let, and after such estimates have been made, and certified and sworn to by the proper Engineer as the Law directs, it shall be the duty of the Board of Public works, or the Commissioner of the District in which the same work may be situated, to make his draft on the Fund Commissioners for the whole amount of such estimate, and in cases where the works have been suspended or shall be hereafter suspended by operation of Law, there shall be no retainer of percentage as is now authorised by Law ^Provided that where Contracts shall have been abandoned by the voluntary act of Contractors the per centage shall be retained as heretofore^

Sec 2. That whenever said drafts shall be presented to the Board of Fund Commissioners and not paid for want of funds, the same shall bear interest at the rate of six per cent per annum from the date of the estimate until paid by the state Provided that where