POWDERED DRUGS 723 



6. Wood fibers wanting. Continued. 



Characteristic odor 223. Opium 



Epidermal cells with papillae". 224. Rosa Gallica 



Fragments of anthers 225. Rosa Centifolia 



Long slender styles 226. Zea 



POWDERS OF A WHITISH APPEARANCE. 



I. Plant Tissues or Cell-Contents recognizable. 



A. Only unaltered starch grains present. 



Excentral and fissured point of origin of growth. 



227. Maranta Starch 

 Excentral and circular point of origin of growth.228. Potato Starch 



Polygonal grains 229. Corn Starch 



Small, polygonal, compound grains 230. Rice Starch 



Ellipsoidal, point of origin of growth indistinct .321. Wheat Starch 

 Characteristic grains 232. Other Starches 



6. Altered and unaltered starch grains present. 



Becomes pasty on addition of cold water 233. Dextrin 



Becomes pasty with hot water ' 234. Sago 



Disintegrates with water 235. Sago (Imitation) 



c. Plant tissues in addition to starch. 



a Do not readily dissolve or swell in cold water. 



Polygonal starch grains 236. Corn Meal 



Free from hairs 237. Corn Bran 



Starch grains 5 to 40 M in diameter 238. Wheat Flour 



Hairs with thick walls and narrow lumen. 



239. Wheat Middlings 



Starch grains 20 to 60 M in diameter 240. Rye Flour 



Thin-walled hairs with large lumen 241. Rye Middlings 



Starch grains 5 to 25 M in diameter 242. Barley Flour 



Sclerenchyma fibers with brown contents. 



243. Buckwheat Flour 



Starch grains 2 to 10 n in diameter 244. Rice Flour 



Hairs broader near the middle 245. Oat Meal 



Lignified hairs, starch grains few 246. Nux Vomica 



Characteristic starch grains 247. Orris Root 



Very long prisms of calcium oxalate 248. Quillaja 



Raphides of calcium oxalate 249. Bryonia 



Aromatic odor 249a. Calamus 



Thin-walled bast fibers. . . .249b. Ulmus 



