778 



BOTANY AND PHARMACOGNOSY. 



189. PYRETHRUM.— Dark brown; parenchymatous cells 

 with irregular crystalloidal masses of inulin; periderm with 

 nearly isodiametric stone cells, the contents of which are yellow- 

 ish-brown; tracheae reticulate, narrow; sclerenchymatous fibers 

 few; secretion reservoirs with oil and resin (Fig. loi, E). 



Fig. 314. Powdered opium: M, protoplasm-like latex, which constitutes the greater 

 proportion of the powder; S, St, thick-walled cells of capsule; A, needle-shaped crystals 

 which sometimes separate in a chloral- iodine mount. The following Rumex tissues are also 

 generally present: E, epidermal cells of leaf; B, bast fibers and T, trachea from Rumex 

 fruit; C, crystals (probably of calcium oxalate). 



The root of Anacychis oMcinaruin contains tannin and an 

 aqueous extract gives a precipitate with ammonio-ferric-alum 

 solution. 



2. Stone Cells Wanting. 



190. GENTIANA. — Light brown (Fig. 210) ; ducts few, sca- 

 lariform or reticulate ;• intermediate fibers non-lignified and with 



