An Act amending the act of May 5, 1927 (P. L. 817, No. 412), entitled, as amended, "An act authorizing and regulating the growth, sale, and distribution of forest tree seedlings, transplants, shrubs and vines by the Department of Forests and Waters; regulating the use of such forest tree seedlings, transplants, shrubs and vines and imposing duties upon the Department of Agriculture with regard to the enforcement of this act," adding a provision authorizing the Department of Environmental Resources to trade surplus tree seed, tree seedlings, scionwood and grafted tree stock.