The State Treasurer is designated as sole agent to receive on State Fiscal Officer’s pay warrant and disburse any and all funds received from sources other than those designated by law on State Fiscal Officer’s warrant, which funds are to be expended under the direction and supervision of state officials or agencies for the benefit of the state. The State Treasurer is authorized and directed to receive on State Fiscal Officer’s pay warrant any and all funds above specified and to be credited, each fund to a trust account for which the donor intends it. The special trust account shall designate for what purpose it is donated, and the State Fiscal Officer’s books and Treasurer’s books shall carry it as such. All funds shall be paid out on requisition signed by the proper agent or agents, properly supported by itemized vouchers, designated so to do on a warrant issued by the State Fiscal Officer upon the State Treasurer. Funds intended to be controlled by this section are those coming from the federal government, foundations and individuals to be expended for educational purposes, roads, agriculture, for making economic or social surveys, and for similar purposes. In no way shall this section interfere with or prevent the purpose of the donor. The state agent or official best fitted or qualified to direct the expenditure of a fund for a specified purpose or the official designated by the donor shall expend the funds, and is hereby given authority in the manner outlined herein.