48 



OF WOOD IN GENERAL 



ft Vessels 1 to several dozen together, in wavy peri- 

 pheral lines in autumn wood : heart wood brown, 

 hard, heavy : sap wood yellowish- white. Elm, 

 JJlmus. 

 % Pores of spring wood forming a broad band of 

 several rows. English, Scotch and Red or 

 Slippery Elm, TJlmus campestris, montdna and 

 fulva. 

 J J Pores of spring wood in a single row, or nearly 

 so. White, Rock, Winged and Cedar Elms of 



Fig. 34.— Transverse section of Dillenia indica. 



U.S.A. Ulmus americdna, racemosa, aldta 

 and crassi folia, 

 *** Vessels in radial lines or queues, wavy or branched, 

 the branches often uniting. 

 •j* All the pith-rays very broad. 



J Woed beset with large pores : heartwood reddish- 

 brown. Vine, Vitis. 

 $J Wood, sulphur yellow, hard : zone of vessels 

 narrow. BarlSerry, Berheris. 

 ;-t Pith-rays so narrow as to be hardly perceptible : 

 heartwoyd oak-brown : zone of vessels very 

 broad and vessels large, but less crowded than in 

 Oak. -Chestnut, Castdnea. 



