Any money deposited in the State Treasury pursuant to Section 11 of the act of Congress referred to in Section 8551 of this code and apportioned to any county or counties of this State as provided in this article, shall be expended by and within each of such counties, in equal shares, solely for the benefit of the public schools and county highways; and it shall be the duty of the county auditor of any county receiving a payment of such money immediately to credit the same as follows: 50 percent thereof to an account in the proper fund on his books earmarked and available solely for expenditures for the benefit of the public schools in such county, and 50 percent thereof to an account in the proper fund on his books earmarked and available solely for expenditures for county highways in such county.