PLATE LVII. 



Fig. 24. Cross section of young stem, x 160: a, greatly swollen muci- 

 lage cavity; b, collenchyma; c, parenchyma of the cortex. 



Fig. 25. Cross section of mid part of stem, x 160: a, mucilage cell. 



Fig. 26. Cross section of base of stem, x 160: a, mucilage cell. 



Fig. 27. Cross section of old part of stem showing distribution of 

 mucilage, X 25: a, collenchyma; b, parenchyma; c, bast fibers; d, 

 phloem; e, pith; m, mucilage. 



Fig. 28. Cross section of young stem, x 25: a. collenchyma; b, paren- 

 chyma; c, bast fibers; d, phloem; e, pith; m, mucilage. 



Fig. 29. Cross section of a part of the root showing distribution of 

 mucilage, X 25: m, mucilage. 



