All funds now in the Treasury derived from the sale of sixteenth section or other school lands, or which may hereafter accrue from sale of such lands, together with the redemption money of other lands in which former accumulations have been invested under an act approved March 1, 1881, entitled “An act to authorize the compromise and settlement of claims for school lands in this state,” are covered into the Treasury and made available for general purposes, and the faith and credit of the state is pledged for the payment of the interest on such fund to the public schools of the state, at the rate of six percent per annum.