DESCRIPTION OF PLATE II. 



Fig. 1. — Taj-odium distichum (hald cypress): cross section through portions 

 of two growth rings. Several resin cells are visible near the lower edge. 



Fig. 2. — Tsuga canadensis (eastern hemlock): cross section. Note decided 

 contrast between early and late wood. 



Fig. 3. — Jinnperus virgrniana (red cedar): cross section through median 

 portion of growth ring showing zonate arrangement of resin cells. 



Fig. 4. — The same: cross section showing very thin late wood; also doubling 

 of the late wood, producing "false ring." Note small size of tracheids. 



Fig. .5. — Qucrcus alba (white oak): cross .section showing small pores with 

 thin walls and angular outlines and in broad band; large pores with tyloses. 



I'iG. 6. — Quercus ruhrn (red oak) : cross section showing small pores with thick 

 walls and circular outlines, and in narrow band ; large pores without tyloses. 



