70 ECONOMIC WOODS OF THE UNITED STATES 



Gerry, Eloise: Fiber Measurement Studies: Length Variations, 

 Where they Occur and their Relation to the Strength and Uses 

 of Wood. Science, 41: 1048 : 179, 1915. 



Groom, Percy: A Preliminary Inquiry into the Significance of 

 Tracheid-Caliber in Conifers. Bot. Gaz., 57:4:287-307, 

 Apr. 1914. 



Lee, H. N., and Smith, E. M.: Douglas Fir Fiber, With Special 

 Reference to Length. For. Quarterly, Dec. 1916. 



Mell, D. C: Length of Tracheids in Coniferous Wood. Paper 

 Trade Journal, New York, June 15, 1911, p. 52. 



Record, Samuel J. : The Significance of Resinous Tracheids, Bot. 

 Gaz., 66: 1:61-67, July 1918. 



Sanio, Karl: Ueber die Grosse der Holzzellen bei der Gemeinen 

 Kiefer (Pinus silvestris L.). Jahrb. Wiss. Bot., 8: 401^20, 

 1872. 



Sanio, Karl: Anatomie der gemeinen Kiefer (Pinus silvestris L.) 

 II. Jahrb. Wiss. Bot., 9 : 50-126. 



Shepard, H. B., and Bailey, I. W. : Some Observations on the 

 Variation in Length of Coniferous Fibers. Proc. Soc. Am. For., 

 9:4:522-527, Oct. 1914. 



Wood Parenchyma (pp. 21-23) 



Krah, F. W.: Ueber die Vertheilung der parenchymatischen 

 Elemente im Xylem und Phloem der Dicotylen Laubbaume. 

 Berlin, 1883. 



Rays (pp. 23-29) 



Chrysler, M. A.: The Medullary Rays of Cedrus. Bot. Gaz., 

 59: 5: 387-396, May 1915. 



Holden, Ruth: Ray Tracheids in the Coniferales. Bot. Gaz., 

 55: 1:56-65, 1913. 



Langdon, LaDema M.: The Ray System of Quercus alba. Bot. 

 Gaz., 65: 4: 313-323, Apr. 1918. 



Thompson, W. P.: Ray Tracheids in Abies. Bot. Gaz., 

 53:4:331-338, Apr. 1912. 



Resin Ducts (pp. 29-31) 



Record, Samuel J.: Intercellular Canals in Dicotyledonous 

 Woods, Journ. Forestry, 16: 4: 429-441, Apr. 1918. 



