20 



ECONOMIC WOODS OF THE UNITED STATES 



tapering, but sometimes they are flattened, or forked, or with a 

 saw edge (Fig. 2, C, C'), adding to the toughness of the wood. 

 Fibres usually run parallel to one another, but in some woods 

 they exhibit a decided interweaving which produces an irregularly 

 grained wood very difficult to split. 



TABLE II 

 LENGTH OF WOOD FIBRES IN DICOTYLEDONOUS WOODS 



References 



DEB ART, A.: Comparative Anatomy, pp. 481-483. 

 SOLEREDER, H.: Anatomy of the Dicotyledons, Vol. II, pp. 1141-1143. 

 GREGORY, E. L.: Pores of the Libriform Tissue, Bull Torrey Bot. Club, 



Vol. XIII, 1886, pp. 197-204; 233-244. 

 ANONYMOUS: Length of Wood Fibers in Broadleaf Woods, Sc. American 



Sup., Sept. 30, 1911, p. 211. 

 SANIO, CARL: Bot. Zeitung, Vol. XXI, No. 13, 1863, pp. 89-111. 



