Current Literature 309 



tion." The scope of the investigation was accordingly limited 

 to a survey of the industries engaged in the distillation of wood, 

 the manufacture of tannin extract, wood pulp, ethyl alcohol, pro- 

 ducer gas, and various minor wood products. The report includes 

 diagrams of apparatus, production costs and yields, statistics of 

 production, future prospects of the industry, and in some in- 

 stances names and addresses of principal manufacturers. It 

 contains little that is new and bears earmarks of being more of 

 a compilation than a report based upon first-hand information 

 collected by the writer. 



S. J. R. 



Structural Timber in the United States. By H. S. Betts and 

 W. B. Greeley. Paper Presented at the Meeting of the Interna- 

 tional Engineering Congress in San Francisco, Cal., Sept. 20-25, 

 1915. Pp. 50. 



This paper gives a survey of the timber resources of the United 

 States with special reference to structural uses. The important 

 species are discussed from the engineer's standpoint, and a sum- 

 mary is given of the data obtained by the U. S. Forest Service 

 on their mechanical properties and factors affecting them, and 

 the methods of timber testing employed at the Madison Labora- 

 tory. Attention is also directed to grading rules and commercial 

 specifications and suggestions made for their improvement. In 

 an appendix are tables giving the number of sawmills and amount 

 of lumber sawed annually, the amount of wood consumed by the 

 principal wood-using industries, average strength values of 

 various structural timbers, and nomenclature and characteristics 

 of the Southern pines. 



S. J. R. 



Eighth Report of the State Forester of Connecticut for the 

 Year 1915. By W. O. Filley. Part III Annual Report of the 

 Connecticut Agricultural Experiment Station. New Haven, 

 Conn. 1916. Pp. 193-232. 



The bulk of this report is devoted to "A Forest Survey of 



