POWDERED DRUGS. 
309 
crystal fibers with monoclinic crystals of calcium 
oxalate. 
174. Santalum Rubrum. — Reddish; ducts with bordered 
pores; sclerenchymatous fibers long, thin -walled; 
crystal fibers with monoclinic crystals of calcium 
oxalate. 
b. Wood Fibers Wanting-. 
175. Crocus. — (See No. 65). 
176. Kino.— (See No. 168). 
177. Lupulinum. — Reddish brown; large character- 
istic secretion hairs about 20 in diameter. In fresh 
Lupulin there are more light yellow-secretion hairs 
than in old. In the latter there are browner or grayish- 
brown resinous masses replacing the light-yellow oil. 
The amount of Humulus fragments should not be too 
large in Lupulin of good quality. 
178. Opium. — (See No. 157). 
179. Rosa Gallica. — Rose-colored; epidermis with 
acute papillae ; pollen grains few, somewhat spherical, 
30 in diameter. 
POWDERS OF A WHITISH APPEARANCE. 
This group includes all those powders which are 
light in color, and comprises chiefly the commercial 
starches, cereals, gums and some of the inorganic sub- 
stances which are occasionally used as adulterants. 
I. PLANT TISSUES OR CELL-CONTENTS 
RECOGNIZABLE. 
A. CONTAINING STARCH. 
a. Only Unaltered Starch Grains Present. 
Grains characteristic for each ; completely soluble 
in glycerin on heating, and precipitated on the addi- 
tion of alcohol, the precipitate being soluble in water. 
