POWDERED DRUGS AND FOODS. 



715 



in diameter; non-glandular hairs; milk vessels accompanying 

 ducts. Mounts in glycerin may show acicular crystals. 



4. HUMULUS. — Light green; calcium oxalate in rosette 

 aggregates, 10 to 15 ^ in diameter; non-glandular hairs unicel- 

 lular, more or less bent, thin-walled, 0.2 to 0.3 mm. long; gland- 

 ular hairs of two kinds (Fig. 298), either with a 3-celled stalk 



Fig. 279. Cannabis indica: Cy, non-glandular hairs containing calcium carbonate 

 in the form of cystoliths; G, multicellular glandular hairs of the bracts; Gs, multicellular 

 heads of glandular hairs; S, papillae of stigma; B, tracheae with bordered pores, present 

 in stem fragments; T, tracheae with annular markings; P, pollen grains; Ca, rosette 

 aggregates of calcium oxalate; N, thick-walled non-glandular hair with numerous papillae 

 on the surface. 



and a nearly colorless, multicellular, glandular head about 50 ix 

 in diameter, or with a short 4-celled stalk and a multicellular, 

 bright yellow, glandular head o.i to 0.3 mm. in diameter. 



5. INSECT POWDER (Persian) (p. 395 ) .^Grayish-green 

 (Fig. 280) ; with numerous rounded and prickly pollen grains, 

 25 IX in diameter; a few crystals 2 to 8 jti in diameter, in stone 

 cells or in parenchyma adjoining; sclerenchyma fibers about 20 /* 



