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PHARMACOGNOSY. 
2. Eriodictyon. — Dark green; calcium oxalate crys- 
tals rosette-shaped, 20 to 25 // in diameter ; non-secre- 
tion hairs one-celled and thick-walled ; secretion hairs 
with one-celled stalk and six to eight-celled glandular 
head. In powder of the stems occur : ducts, which are 
spiral or have simple or bordered pores ; sclerenchy- 
matous fibers either non-lignified and thin-walled, or 
lignified and thick-walled, and with numerous simple 
pores ; pith cells somewhat tabular, thick - walled, 
slightly lignified, and with numerous simple pores. 
3. Galla (Chinese or Japanese). — Grayish green ; cal- 
cium oxalate crystals about 20 yu. in diameter ; starch 
grains about 40 /* in diameter ; non-secretion hairs ; 
milk vessels accompanying ducts ; mounts in glycerin 
may show acicular crystals of gallic acid. 
4. Humulus. — Light green ; calcium-oxalate crystals 
rosette-shaped, 10 to 15 /x in diameter ; non-secretion 
hairs unicellular, more or less bent, thin-walled, 02 to 
03 mm. long ; secretion hairs of two kinds, either with 
a three-celled stalk and a nearly colorless, multicellu- 
lar, glandular head about 50 /i in diameter, or with a 
short four-celled stalk and a multicellular, bright yel- 
low, glandular head 01 to 0 3 mm. in diameter. 
5. Insect Powder [Persian ( Pyrethrum roseum )]. — Gray- 
ish green ; with numerous rounded and prickly pollen 
grains, 25 ft ; some few crystals 2 to 8 /* in diameter, 
in stone cells or in parenchyma adjoining ; scleren- 
chyma-fibers about 20 fi in diameter and 100 to 160 
H long; fragments of T-non-secretion hairs less nu- 
merous than in Dalmatian ; characteristic, isolated, 
somewhat rounded or elliptical parenchyma cells, also 
occurring in papillse-like fragments ; fragments of 
papillce (epidermis of corolla), acute and more numer- 
ous than in Dalmatian ; secretion hairs about 50 yu in 
diameter, being smaller than in Dalmatian; rose- 
