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SCIENTIFIC AND APPLIED PHARMACOGNOSY 



reservoirs from 0.080 to 0.150 mm. in diameter; the cells of the loose 

 mesophyll occasionally with rosette aggregates of calcium oxalate 

 from 0.010 to 0.025 mm. in diameter; collateral fibro vascular bundles 



FIG. 160. Pilocarpus pinnatifolius: A, transverse section of lamina showing 

 upper epidermis (E), oil cavities (Se), palisade cells (P), some of which con- 

 tain rosette aggregates of calcium oxalate, loose parenchyma (m), some of 

 the cells of which' contain calcium oxalate (o), and lower epidermis with a 

 stoma (Sp). B, surface view of epidermis showing basal portion of a non- 

 glandular hair (h). The basal remains of the hairs are often present, the 

 upper portions being detached. C, view of the under surface of the lamina 

 showing stoma ta (sp). D, diagram showing the arrangements of the tissues 

 in one of the secondary veins: P, palisade cells; m, loose parenchyma; Sc, 

 sclerenchyma; s, sieve; g, tracheae. E, transverse section of the primary or 

 middle vein showing palisade cells (P), elongated parenchyma (p), oil glands 

 sieve (s), trachese (g), which surrounds parenchyma (m), thus distinguishing 

 it from the secondary vein. F, surface view of upper epidermis of lamina. 

 After Meyer. 



each surrounded by a more or less interrupted circle of several rows 

 of thick-walled, slightly lignified sclerenchymatous fibers; trachea 

 associated with strongly lignified wood fibers; among the cells of the 



