Whenever any county agricultural society or officer thereof has heretofore contributed funds for the purchase or condemnation of lands used for county fair purposes and title to such lands has been conveyed to the county, the county board of any such county is hereby authorized and empowered to appropriate to such society or officer thereof making such contribution an amount equal to the moneys so contributed by it or such officer in acquiring such land, such appropriation not to exceed in any event, the sum of $3,000.