POWDERED DRUGS AND FOODS. 751 



102. CAMBOGIA. Irregular, bright yellow masses, made 

 up of small yellow particles (p. 648). 



POWDERS OF A BROWNISH COLOR 



This group includes all those powdered drugs which have a 

 light brown (raw sienna or raw umber), dark brown (Vandyke 

 brown), blackish-brown (sepia), or grayish-brown color. This 

 is the largest group and includes most of the powdered roots, rhi- 

 zomes and barks, together with a few flowers, fruits and seeds. 



I. FIBROVASCULAR TISSUE PRESENT. 



A. CONTAINING STARCH. 



a. CALCIUM OXALATE CRYSTALS PRESENT. 



a In Rosette Aggregates. 



I. With Sclerenchymatous Fibers. 



* Containing Oil, Resin or Tannin Masses. 



103. BELLADONNA RADIX. (See No. 117.) 



104. GOSSYPII CORTEX. Light brown (Figs. 231 ; 231a; 

 300, H) ; bast fibers long, narrow, thick-walled, lignified ; 

 starch grains somewhat spherical, 4 to 20 /a in diameter, single or 

 compound ; parenchymatous cells with irregular yellowish and 

 reddish tannin masses ; calcium oxalate crystals rosette-shaped, 

 about 20 IX in diameter. 



105. RUBUS. Light brown; bast fibers numerous, long, 

 thick-walled, lignified ; calcium oxalate in 'rosette aggregates 25 

 to 30 fx in diameter ; starch grains nearly spherical, 3 to 7 /x in 

 diameter, single or compound. 



106. JUGLANS. Crystals usually in rosette aggregates 15 

 to 35 iM or sometimes in monoclinic prisms 10 to 15 fx, occurring 

 in parenchyma or occasionally in crystal fibers ; bast fibers, 30 /x 

 wide and very long; stone cells, 35 to 50 /x; oily drops and pur- 

 plish-brov.m tannin masses in parenchyma. /. cinerea is distin- 

 guished from /. alba and J. nigra in that both of the latter possess 

 numerous crystal fibers containing prismatic or rhombohedral 



