DESCRIPTION OF PLATE V. 



Fig. 1. — Murux rubra (reel mulberry): cross section showing arrangement of 

 pores in late wood, width of rays, and presence of tyloses in lar>."' pores. 



Fig. 2. — Frnxnni.i nigra (black ash): cro.-.s 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 poro. 



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

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



Fig. .j. — Betula Irnta (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. 



