PO WDERED DR UOS. 
279 
shaped, or occasionally in monoclinic prisms, 10 to 20 g 
in diameter; fragments colored reddish with potassium 
hydrate solution. 
The powder of Indian senna ( Cassia angustifolia ) is 
dark green and has relatively few non-secretion hairs. 
In the powder of Argel Leaves ( Solenostemma Argel) 
(Fam. Asclepiadacese) the non secretion hairs are three 
to four-celled. In the leaves of Castanea dentata (Fam. 
Fagacese) the non-secretion hairs are relatively few, 
0'2 to 0'5 mm. long, nearly smooth, thick-walled, occa- 
sionally in groups of three to eight and spreading from 
the base ; the calcium-oxalate crystals are numerous, 
rosette shaped or in monoclinic prisms, 10 to 35 g in 
diameter, occasionally in crystal fibers; the parenchy- 
matous cells contain irregular yellowish-brown tannin 
masses which are colored blue with ammonio-ferric 
alum solution. 
16. Uva Ursi. — (See No. 19). 
c. Secretion and Non-Secretion Hairs Wanting-. 
17. Coca. — Dark green ; calcium oxalate in monoclinic 
prisms 3 to 10 g in diameter; walls of under epidermal 
cells extended as minute papillae. 
1 8. Guaiaci Resina. — Dark green ; numerous lemon- 
yellow or dark-brown resin masses, which when 
mounted in chloral have a wine-colored halo around 
them ; few fragments of tissues with characteristic 
sclerenchymatous cells and fibers ; few crystals of 
calcium oxalate in monoclinic prisms. 
19. Uva Ursi. — Yellowish green; calcium oxalate in 
monoclinic prisms 7 to 10 g in diameter, frequently 
in crystal fibers; non-secretion hairs few, somewhat 
curved, one-celled, thick-walled, longitudinally striate ; 
mesophyl with irregular yellowish-brown tannin masses; 
characteristic sclerenchymatous fibers. 
