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 ju, 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 /n in 

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

 yellow, glandular head o.i to 0.3 mm. in diameter (Fig. 136). 



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

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

 25 /A in diameter; a few crystals 2 to 8 /^ in diameter, in stone 

 cells or in parenchyma adjoining; sclerenchyma fibers about 20 /j. 



