DISTILLATION OF STUMPWOOD. 69 



profits from distilling western yellow -pine wood, costs and values 

 must be calculated on the basis of the cost of labor, wood, equip- 

 ment, overhead, etc., and on the basis of the value of the products, 

 at the time the estimate is made. 



LITERATURE CITED. 



(1) BERRY, S. Lumbering in the sugar and yellow pine region of California. 



U. S. Dept. Agr. Bull. 440. 1917. 



(2) BETTS, H. S. Possibilities of Western pines as a source of naval stores. 



U. S. Dept. Agr., Forest Service Bull. 116. 1912. 



(3) GRAVES, H. S., and ZIEGLER, E. A., The woodsman's handbook. U. S. 



Dept. Agr., Forest Service Bull. 36. 1910. 



(4) HALL, W. L., and MAXWELL, H. Uses of commercial woods of the United 



States : II. Pines. U. S. Dept. Agr., Forest Service Bull. 99. 1911. 



(5) KREMERS, E. Notes on coniferous oils: II. Oil from Pinus sabwiana. In 



Pharm. Rev., 18: 165-172. 1900. 



(6) HUNGER, T. T. Western yellow pine in Oregon. U. S. Dept. Agr. BulL 



418. 1917. 



(7) SCHORGER, A. W. An examination of the oleoresins of some Western 



pines. U. S. Dept. Agr., Forest Service Bull. 119. 1913. 



(8) SHATTUCK, C. H. Methods of clearing logged-off land. Univ. Idaho Agr. 



Expt. Sta. Bull. 91. 1916. 



(9) SMITH, F. H., and PIERSON, A. H. Production of lumber, lath, and shingles 



in 1916. U. S. Dept. Agr. Bull. 673. 1918. 



(10) SUDWORTH, G. B. The pine trees of. the Rocky Mountain region^ U. S. 



Dept. Agr. Bull. 460. 1917. 



(11) THOMPSON, H. Cost and methods of clearing land in western Washington. 



U. S. Dept. Agr., B. P. I. Bull. 239. 1912. 



(12) VEITCH, F. P., and DONK, M. G. Wood turpentine: Its production, refin- 



ing, properties, and uses. U, S. Dept. Agr., Bur. Chem. Bull. 144. 1911. 



(13) WOOLSEY, T. S., JR. Western yellow pine in Arizona and New Mexico. 



U. S. Dept. Agr., Forest Service Bull. 101. 1911. 



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