DESCRIPTION OF PLATE V. 



FIG. 1. Morus rubra (red mulberry): cross section showing arrangement of 

 pores in late wood, width of rays, and presence of tyloses in large pores. 



FIG. 2. Fraxinus nigra (black ash) : cross section showing isolated pores in 

 late wood not joined tangentially by wood parenchyma. Outer margin of growth 

 ring composed of thin layer of wood parenchyma. 



FIG. 3. Alnus oregona (red alder) : cross section showing aggregate ray and 

 distribution of pores. 



FIG. 4. The same: tangential section showing aggregate ray, intermediate 

 uniseriate rays, vessels, wood fibres, and wood-parenchyma strands. 



FIG. 5. Betula lenta (sweet or black birch) : cross section showing size and 

 distribution of pores and width of rays. Note wood-parenchyma cells, isolated 

 or in short tangential lines. 



FIG. 6. Ostrya virginiana (hornbeam): cross section showing size and 

 arrangement of pores and distribution of wood-parenchyma cells in inconspicuous 

 tangential lines. 



