114 THE UNIVERSITY SCIENCE BULLETIN. 



Fig. 14. Surface view of the epidermal cells between the ribs of the 

 stem in region III, showing type and frequency of stomata. X 225. 



Fig. 15. Portion of radial longitudinal section of the stem in region III, 

 showing epidermis, a, the parenchyma of the primary cortex, e, and the 

 starch sheath, d: k', cuticle; p', intercellular space. X 225. 



Fig. 16. Clothing hair of the epidermis of the stem in region I: a, basal 

 cell; k', cuticle; q' , oil globule; u', terminal portion; a", basal portion of one 

 or more short cells above the basal cell. X 330. 



Fig. 17. Glandular hair of the epidermis of the stem in region I: a, 

 basal cell; k' cuticle; u', terminal portion; a", basal portion consisting of two 

 or more short cells; h", dense cell contents. in terminal portion; c", small oil 

 globule; d", large oil globule. X 225. 



Fig. 18. Longitudinal section of the collenchyma of the primary cortex 

 of the stem in region III. X 225. 



Fig. 19. "Portion of cross section of the stem in region V, showing cork 

 cells, h': d, starch sheath; o, area of one to six rows of very large parenchyma 

 cells of the primary cortex around the stem; q', bast fiber. X 225. 



Fig. 20. Portion of cross section of the stem in region V, showing lenticel, 

 h': a, epidermis; c, parenchyma of the primary cortex; d, starch sheath; o, 

 area of one of six rows of very large parenchyma cells of the primary cortex 

 around the stem; /', bast fiber; k', cuticle; p', intercellular space; /", stoma. 

 X 225. 



PLATE VI. 



Fig. 21. Portion of longitudinal section of the stem in region III: d, 

 starch sheath; e', outer portion of the pericycle, the cell walls of which have 

 not lignified, corresponding to the area of pericycle e' in cross section, fig. 9. 

 X 225. 



Fig. 22. Portion of cross section of the stem in region V to show veri- 

 ation in location of bast fibers in the pericycle: d, starch sheath; o, portion 

 of area of one to six rows of very large parenchyma cells of the primary cortex 

 around the stem; /', bast fibers; e', outer area of the pericycle, the cell walls 

 of this area not having lignified. X 225. 



Fig. 23. Longitudinal section of bast fiber of medium length, from the 

 outer portion of the pericycle of the stem in region IV, corresponding in 

 location to the area of pericycle e' in cross section, fig. 9. X 225. 



Fig. 24. Macerated wood fibers of medium size from the anomalous 

 xylem of the stem in region IV. X 225. 



Fig. 25. Longitudinal section of cells in the central portion of the peri- 

 cycle from region III of the stem, corresponding to the area of pericycle, e", 

 fig. 10, in region IV. X 225. 



Fig. 26. Portion of cross section of the stem in region V, showing the 

 areas of pericycle e" and /, and cells of the inner portion of the anomalous 

 xylem zone, c', the cells of which in this region of stem resemble pith in shape 

 in cross section: q, tissue designated as an anomalous phloem zone in this 

 article; r, secondary medullary ray; s, anomalous phloem; i, pericycle cells 

 in the outer part of the tissue designated as an anomalous phloem zone in 

 this article; c', anomalous xylem having cellulose walls and located in the 



