[Footnote 2: For an interesting account of an application of this method, see Ward, p. 35.] [Footnote 3: To encourage such forest extension, the Forest Service is doing much by the publication of bulletins recommending methods and trees suited to special regions, as, e.g., on Forest Planting in Illinois, in the Sand Hill Region of Nebraska, on Coal Lands in Western Pennsylvania, in Western Kansas, in Oklahoma and adjacent regions, etc.] THE USE OF THE FOREST. REFERENCES:[A] I Utilization. Pinchot, _Primer_, II, pp. 14-18, 38-48. Bruncken, pp. 121-131, _For. Bull._ No. 61. (1) Protective. Pinchot, _Primer_, II, pp. 66-73. Craft, _Agric. Yr. Bk._, 1905, pp. 636-641, (Map. p. 639.) Toumey, _Agric. Yr. Bk._, 1903, p. 279. Bruncken, pp. 166-173. _For. and Irrig._, passim. Shaler, I, pp. 485-489. (2) Productive. Kellogg, _For. Bull._, No. 74, Fernow, _For. Invest._, p. 9. Roth, _First Book_, p. 133. Zon & Clark, _Agric. Yr. Bk._, 1907, p. 277. Boulger, pp. 60-76. Roth, _Agric. Yr. Bk._, 1896, p. 391. Fernow, _Economics_, pp. 23-33. (3) Esthetic. Roth, _First Book_, p. 180. II Preservation. Pinchot, _Primer_, II, pp. 18-36. Bruncken, pp. 95, 190. Graves, _For. Bull._, No. 26, pp. 67-70. Roth, _First Book_, pp. 41-76, 193-194. Roth, _For. Bull._, No. 16, pp. 8, 9. Fernow, _Economics_, 165-196. Planting. Roth, _First Book_, pp. 76-94, 195-198. Hall, _Agric. Yr. Bk._, 1902, pp. 145-156. _For. Circs._, Nos. 37, 41, 45, 81. Bruncken, pp. 92, 133. _Forestry Bulletins_ Nos. 18, 45, 52, 65. III Improvement. Bruncken, pp. 134-135, 152-160. Graves, _For. Bull._, No. 26, p. 39. Pinchot, _Adirondack Spruce_, p. 4. Harwood, pp. 143-181. [Footnote A: For general bibliography, see p. 4.] APPENDIX. HOW TO DISTINGUISH THE DIFFERENT KINDS OF WOOD.[A] BY B. E. FERNOW AND FILIBERT ROTH.