CLASSIFICATION OF HARD-WOODS 45 



compact, yellow wood, characteristically mottled 

 with brown, with uniformly scattered vessels, may, 

 perhaps, be classed here. ) 

 2. Without false rings. 



a. Soft, with no distinct heart. Silk-cotton, Bomhax, Mango, 

 '^ Mangifera, etc. 



h. Harder, denser, usually with distinct heart. Siris, 

 Albizzia Lebbek, Eng, Dipterocdrpus tuberculdtus, etc. 

 (Compare Fig. 33, p. 47.) 



B. With distinct annual rings. j 



1. Ring-porous: vessels in spring wood large or numerous, those 

 in summer wood small or few and scattered. 

 a. Vessels in the spring wood larger. \ 



Fig. 31.— Transverse section of Common Ash (Frdxinus excelsior), photographed 



from nature. 



(i) Vessels in tree-hke or dendritic groups, or in circles, 

 often scattered in the inner part of the rings. 

 * Shghtly dendritic or concentric : pores in summer 

 wood minute, regularly distributed, singly or in 

 groups, or in short peripheral, but never radial lines. 

 { Pith-rays minute, scarcely distinct. 

 § Wood heavy and hard : vessels in summer wood 

 not in clusters, or 2-4 together. 

 (a) Heartwood not yellow in radial section ; con- 

 tinuous zone of pores in spring wood. Ash, 

 Frdxinus. 

 Vessels in summer wood in peripheral lines. 



