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



FIG. 6. Quercus rubra (red oak) : cross section showing small pores with thick 

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



