ECONOMIC WOODS OF THE UNITED STATES 111 



Knapp, Joseph B.: Fire-killed Douglas Fir: A Study of Its Rate of De- 

 terioration, Usability, and Strength. Bui. 112, U. S. Forest Service, 1912. 



Lee, H. N.: Canadian Woods for Structural Timbers. Bui. 59, For. 

 Branch, Dept. Int., Canada, 1917. 



Record, Samuel J.: Douglas Fir. Amer. Architect, 112: 2195: 329-333, 

 Nov. 7, 1917. 



15 Larch: 



Ross, A. H. D.: Commercial Importance of Tamarack. Can. Lumberman 

 and Woodworker, 35: 15: 36-37, Aug. 1, 1915. 



u Spruce: 



Sudworth, George B.: The Spruce and Balsam Fir Trees of the Rocky 

 Mountain Region. Bui. 327, U. S. Forest Service, 1910. 



Hodson, E. R., and Foster, J. H.: Engelmann Spruce in the Rocky 

 Mountains. Cir. 170, U. S. Forest Service, 1910. 



Jeffrey, Edward C: The Comparative Anatomy and Phylogeny of the 

 Coniferales. Part II, Abietinese. Mem. Boston Soc. Nat. His., 6: 1, 1905. 



Bastin, E. S., and Trimble, H. : A Contribution to the Knowledge of North 

 American Coniferae. Amer. Journ. Pharm., 68: 8: 409-422, 1896. 



v Picea rubens: 



Buttrick, P. L.: The Red Spruce. Amer. For., 22:276:705-711, Dec. 

 1916. 



Murphy, Louis S.: The Red Spruce: Its Growth and Management. Bui. 

 544, U. S. Dept. Agr., 1917. 



ls Fir: 



Sudworth, George B.: The Spruce and Balsam for Trees of the Rocky 

 Mountain Region. Bui. 327, U. S. Forest Service, 1916. 



Thompson, W. P.: Ray Tracheids in Abies. Bot. Gaz., 53:4:331-338, 

 Apr. 1912. 



^Hemlock: 



Ross, A. H. D.: The Commercial Importance of Hemlock. Can. Lumber- 

 man and Woodworker, 35: 12: 32-33, June 15, 1915. 



x Tsuga helerophylla: 



Hanzlik, Edward J., and Oakleaf, Howard B.: Western Hemlock: Its 

 Forest Characteristics, Properties and Uses. Timberman, Portland, Ore., 

 Oct. 1914. 



Allen, Edward T. : The Western Hemlock. Bui. 33, U. S. Bur. For., 1902. 



Oakleaf, Howard B. : Wood-using Industries of Oregon. Pub. by Oregon 

 Cons. Assn., Portland, Ore., 1911, pp. 29-30. 



21 Sequoia: 



Detwiler, Samuel B.: The Redwoods. Amer. For., 22:270:323-332, 

 June 1916. 



Hall, William R., and Maxwell, Hu: Uses of Commercial Woods of the 

 United States. I. Cedars, Cypresses, and Sequoias. Bui. 95, U. S. Forest 

 Service, 1911, pp. 57-62. 



Jeffrey, Edward C: The Comparative Anatomy and Phylogeny of the 

 Coniferales. Part I, The Genus Sequoia. Mem. Boston Soc. Nat. His., 

 5: 10: 441-459. 



