APPENDIX. 



303 



ADDITIONAL NOTES continued. 



a.' Lines of pores in summer wood fine, not as wide as the inter- 

 mediate spaces, giving rise to very compact grain . . . ROCK ELM. 

 &.' Lines of pores broad, commonly as wide as the intermediate 



spaces WINGED ELM. 



c. Pores in spring wood indistinct, and therefore hardly a ring-porous 

 wood . CEDAR ELM. 



Fig-. 138. Wood of Elm. 

 a red elm; , white elm; c, wing-ed elm. 



su.w; 



Fig-. 139. Walnut./. r.,'pith 

 rays; c. /., concentric lines; 

 ?', vessels or pores; sti. w., 

 summer wood; sp. w, 

 spring- wood. 



Fig-. 140. Wood of Cherry. 



