PROPERTIES OF WOOD. 



vessels and parenchyma there run, in fine sections, as in 

 Fig. 7, line bright bands of parenchyma parallel to the annual 

 rings : in very slowly grown wood (Fig. 8), these are hardly 

 visible without a magnifying glass. 



n,. /! 



b . v 



Fig. 8. Narrow-zoned oak- 

 wood. Each ring bordered 

 bv a /one of wide vessels. 



Fig. 7. Type of Oakwood (Quercus). 



// Transverse section. *V Radial section. 

 F Tangential section. J/, M Medullary 

 rays, r/, c Sapwood. r, a Heart wood. 



:' a 



I b' 



. a' 



Fig. t). Wooil of the red oak. 



a 1 , r/' 2 , a* Zones of spring- 

 wood. JA, 7/ 2 , /> ;( Zones of sum- 

 mer-wood, r. r, r 1 Medullary 

 rays. 



Radial Section. The pores appear as depressions like 

 grooves, rendering the annual rings distinct ; these grooves 

 gleam slightly if the section is through heartwood, the vessels 

 being iilled with thyloses (internal growth of cells). The 

 medullary rays show as broad bands, or as portions of bands, 



