56 OF WOOD IN GENERAL. 



t Vessels 1-8 together : pith-rays fine, but distinct. 

 | Heartwood yellowish or greenish brown to black, 



hard : sapwood narrow, yellowish. Laburnum. 

 || Heartwood greenish or yellowish white, hard, 



heavy : sapwood riot differing. Hackberry, 



Celtis (Fig. 32). 



FIG. 33. Transverse section of Common Elm (Ulmus camptelris). 



ft Vessels 1 several dozen together, in wavy peri- 

 pheral lines in autumn wood : heartwood brown, 

 hard, heavy : sapwood yellowish -white. Elm, 

 Ulmus. 



| Pores of spring wood forming a broad band of 

 several rows. English, Scotch and Red or Slip- 

 pery Elm, Ulmus campfatris, montdna (Figs. 33 

 and 34), and fulva. 



1 1 Pores of spring wood in a single row, or nearly so. 

 White, Rock, Winged and Cedar Elms of U.S. A., 

 Ulmus americdna, racemosa, aldta and erassifdlia. 



