200 



PLANT ORGANS OR PARTS OF PLANTS, 



granular; the walls are regularly and strongly cutinized, 

 Huanuco leaves possessing a thicker epidermis than the 

 Truxillo. The lower surface is provided with stomata, 

 which are thickly distributed. The outer wall of the 

 epidermis on this side is swollen, making small, regular, 

 readily recognizable protuberances. The epidermal cells 



Fig. 53. — Coca Leaf Powder. 

 EP, Epidermis, side view, showing papillae; Epi, epidermis seen 

 from above; Pr, parenchyma; F, fibres; T, tracheids; C, crystals; H, 

 hair; V, pitted vessels; E, lower epidermis, side view below, surface 

 above; B, bast fibre. 



of the under side are smaller than those of the upper. 

 The epidermis also has a few simple multicellular hairs; 

 these are few in number and readily overlooked, and are 

 not figured in many illustrations of this powder. The 

 fibres of the petioles, midribs, and veinlets form a con- 

 spicuous feature, though not in great abundance. Vessels 

 and fibres are found together. The vessels are of the 



