N.H. Rev. Stat. Ann. § 227-H:7

The state treasurer is hereby authorized to receive at any time such sums of money as may be donated for the purpose of purchasing, maintaining, and improving state reservations and buildings on them, or any other forestry project. Money so received shall be converted into a continuous fund or funds from which payments shall be made in accordance with the stipulations of the donor upon warrant of the governor for such purposes as are approved by the department.