POWDERED DRUGS. 
277 
colored fragments in chloral mounts possibly more 
numerous in the Persian powder. 
6. Stramonii Folia. — Dark green; calcium oxalate in 
rosette-shaped crystals 10 to 20 y in diameter; non- 
secretion hairs few, two to three-celled, with numerous 
slight centrifugal projections ; secretion hairs few, 
stalk one to two-celled, glandular head two to four- 
celled. 
7. Pilocarpus. — Dark green ; epidermal cells on sur- 
face view five to six-sided, walls straight; calcium- 
oxalate crystals rosette-shaped, 20 to 30 p in diameter, 
frequently in palisade cells and also in cells in the air 
spaces of the stomata ; mesophyl cells frequently with 
reddish-brown tannin masses, turning green with 
ammonio-ferric sulphate solution ; non-secretion hairs 
one-celled, thick-walled, with numerous slight centrif- 
ugal projections, 0 4 to 0'6 mm. long in P. Jaborandi 
and 40 to 60 p long in P. pennatifolius and P. micro- 
phyllus. In P. microphyllus the stomata are smaller 
than in the other two species. 
b. Secretion and Non-Secretion Hairs Wanting - . 
8. Buchu. — Light green ; calcium - oxalate crystals 
rosette-shaped, 15 to 25 p in diameter ; epidermal cells 
with irregular masses or sphere-crystals of a carbo- 
hydrate 30 to 50 p in diameter, and with walls modi- 
fied to mucilage ; oil globules numerous. 
9. Conium. — Grayish green or yellowish brown ; cal- 
cium - oxalate crystals rosette-shaped, 1 to 2 p in 
diameter, those in aleurone grains about 5 p in di- 
ameter; parenchyma with chloroplastids and starch 
grains 2 to 4 p in diameter ; sclerenchymatous fibers 
long, thin-walled, with numerous simple oblique 
pores ; intermediate fibers with reticulated walls ; cells 
of pericarp nearly isodiametric, yellowish, irregularly 
