CORTEX CINNAMOMI. CINNAMON. 



163 



three cells in width. Bast fibres, single or in groups of 

 two, three, or four, are few in number; mucilage cells are 

 also rare, but large oil spaces are common and character- 

 istic. The sieve tubes are numerous, but for the most 

 part have undergone a keratenchymatous change, being 

 reduced to strings of thick- walled cells, with very small 



Fig. 41. — Powdered Cassia Cinnamon. 

 St, Stone cells, differing in thickening of walls; CST, cork stone 

 cells; P, oarenchvma; O.S, mucus cell; C, crystals; Cr, cork; B.bast 

 fibres; M, medullary ray; F, short fibre; S, starch; O, oil cell; Rb, 

 bast fibre. 



lumens. A few crystals may be found in the cells of the 

 medullary rays or in special crystal sacs near the medul- 

 lary rays. 



Powder. — The constituents of the powder are stone 

 cells, cork cells, parenchyma, bast, crystals, and starch. 



The stone cells are very numerous. They vary widely 

 both in shape and in the character of their thickening. 



