Wisconsin Constitution Art. VIII § 10. Internal improvements

(1) Whenever grants of land or other property shall have been made to the state, especially dedicated by the grant to particular works of internal improvement, the state may carry on such particular works and shall devote thereto the avails of such grants, and may pledge or appropriate the revenues derived from such works in aid of their completion.

(2) The state may appropriate money in the treasury or to be thereafter raised by taxation for:

(3) The state may appropriate moneys for the purpose of acquiring, preserving and developing the forests of the state. Of the moneys appropriated under the authority of this subsection in any one year an amount not to exceed two-tenths of one mill of the taxable property of the state as determined by the last preceding state assessment may be raised by a tax on property.