The county cemetery fund must be deposited in a depository designated by the county board, in the name of the county and at the highest rate of interest that the depository will pay on the fund. The bond or security given to the county by the depository must be taken and held as security for the fund. The treasurer of the county shall keep an accurate and separate account of the fund and annually draw from the depository the interest accruing on the fund to distribute as hereinafter provided.