It shall be the duty of the state treasurer to receive any and all moneys paid or offered to be paid to him as such treasurer by the treasurer of the United States on account of the moneys received from such forest reserves, under and by virtue of the Act of Congress of June 30, 1906, and to keep a separate account of the sums received from each reserve, and to apportion the distributive shares of the same among the several counties in which such forest reserves are situated in proportion to the area of such reserve in such county, and to pay the same over to the several county treasurers of such counties as soon after the same is received as such apportionment can be made.