SHADE TREES. 



223 



Fig. 95. — Showing croas-seotion of Carolina \)0\>\a,r (Populus deltoideti Marsh). 1, Cross- 

 section of normal stem, enlarged; 2, same, sbowing abnormal growth; 3, naked-eye 

 view of same; 4, section of a normal stem; 5, cross-section of trunk of tree showing 

 the splitting of the bark; a, bark; 6, cork cambium; c, cortex; rf, phloem; e, abnor- 

 mal parenchyma; /, camliiiim; g, wood or xyleni. 



