The state treasurer shall keep accurate accounts of the reserve fund and the investment and earnings thereof, to the end that the total reserve fund shall at all times, as nearly as may be, be properly and fully invested and, to meet current demands for pension or lump sum payments, may, if necessary, make temporary loans to the reserve fund out of the accident fund, repaying the same from the earnings of the reserve fund or from collections of its investments or, if necessary, sales of the same.