DESCRIPTION OF PLATE II. 



Fig. 1. — Taxodium distichum (bald cypress) : cross section through portions 

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



Fig. 2. — Tsv,ga canadensis (eastern hemlock) : cross section. Note decided 

 contrast between early and late wood. 



Fig. 3. — Juniperus virginiana (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. — Quercus alba (white oak): cross section showing small pores with 

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



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

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



