The most important point derived from this calculation is in regard to areas required for a sustained supply, which are in the ratio of 4 to 1. Every tract of 10,000 acres which is devoted to hemp raising year by year is equivalent to a sustained pulp-producing capacity of 40,500 acres of average pulp-wood lands. In other words, in order to secure additional raw material for the production of 25 tons of fiber per day there exists the possibility of utilizing the agricultural waste already produced on 10,000 acres of hemp lands instead of securing, holding, reforesting, and protecting 40,500 acres of pulp-wood land. The annual growth per acre, although decidedly in favor of hurds, has little bearing on the project, because the utilization of the hurds is subordinate to the raising of hemp, and the paper manufacturer probably could afford to use only hurds resulting from the hemp industry. =PHYSICAL TESTS OF THE PAPERS PRODUCED.= Samples of paper produced in the seven tests were submitted to the Leather and Paper Laboratory of the Bureau of Chemistry. The report of that bureau on its tests is given in Table III. TABLE III.--_Report of the Leather and Paper Laboratory of the Bureau of Chemistry on papers manufactured from hemp hurds._ -----------+-----+------+-------------------+----------+ | | | Weight of 500 | | Laboratory | Run | | sheets. |Thickness,| No. | No. | Ash. +---------+---------+ 1/10000. | | | | | | | | | |25 by 38.|25 by 40.| | | | | | | | -----------+-----+------+---------+---------+----------+ | |_Per | | | | | | ct._ |_Pounds._|_Pounds._| | 31570 | 144 | 13.9 | 48 | 50-1/2 | 33 | 31571 | 143 | 14.5 | 49 | 51-1/2 | 35 | 31572 | 142 | 9.5 | 49-1/2 | 52 | 33 | 31573 | 141 | 10.9 | 48 | 50-1/2 | 38 | 31574 | 140 | 11.4 | 42 | 44 | 30 |[Transcriber's 31575 | 139 | 13.4 | 55 | 58 | 40 | note: Table III 31576 | 138 | 10.4 | 56 | 59 | 40 | continues below] -----------+-----+------+---------+---------+----------+