inte:rcellui,ak canals in dicotyledonous woods 441 



10. Van Tieghem, Ph. : Canaux secreteur dans les Dipterocarpees. Jour, de Bot., 



1891, pp. 377-85. 



11. Guerin, Ch. : Appareil secreteur dans Dipterocarpees. Comptes Rendus, 140, 



1905, pp. 520-522; 142, 1906, pp. 102-104. 



12. Schneider, E. E. : Commercial woods of the Philippines : Their preparation 



and uses. Bui. No. 14, Phil. Bu. For., Manila, 1916. 



13. Brown, F. B. H. : Hawaiian woods. Thesis, Yale University, MS., 1918. 



14. Viguier, Rene : Recherches anatomiques sur la classification des Araliacees. 



Ann. Sc. Nat., Bot., 9e serie, t. 4, pp. 1-210. 



15. Hohnel, Franz v. : Beitriige zur Pflanzenanatomie und Physiologic. IV. 



Ueber gefassfiihrende Holzer mit Harzgangen. Botanische Zeitung, 40: 

 10:166 (1882). 



EXPLANATION OF FIGURES 



Fig. I. Section of a ray of Didymopanax morototoni (Aral.) containing four 



secretory canals. It will be noted that the limiting cells are of approximately 



the same size and shape of the other ray cells. 

 Fig. 2. Section of a ray of Rhus lauriiia (Anac.) showing an extremely small 



intercellular duct surrounded by numerous small cells, which exhibit decided 



contrast from the others. 

 Fig. 3. Section of a ray of Gluta tavoyana (Anac.) showing a canal near one 



edge and the small size of the limiting cells. 

 Fig. 4. Section of a ray of Astronium sp. (Anac.) with a duct surrounded by 



very thick-walled cells. 

 Fig. S. Typical canal in the rays of Santiria nitida (Burs.). 

 Fig. 6. Section of a canal in a ray of Odina wodicr (Anac.) showing a distinct 



epithelium composed of a single layer of cells with large simple pits facing 



the cavity. 

 Fig. 7. Typical radial canal in quebracho, Schinopsis lorentcii (Anac). 

 Fig. 8. Transverse section of two vertical canals in the wood of Drimycarpus 



raccmosa (Anac). They are in a tangential zone of wood parenchyma and 



show no evidence of lysigenous enlargement. 



