POWDERED DRUGS AND FOODS. 709 



* Tracheae numerous. — Continued. 



tt Starch grains 5 to 15 or 20 /t in diameter. 



Characteristic starch grains. 143. Zingiber 



Odor of coumarin 144. Tonka 



Chocolate taste 145. Cocoa Shells 



Fragments of milk vessels. 146. Apocynum 



Raphides 45 /* long 147. Convallaria 



Raphides 6 to 8 i" long. . . 148. Sarsaparilla 

 Ducts with bordered pores... 149. Sumbul 

 Stone cells characteristic. . .150. Valeriana 



Stone cells 151. Methysticum 



** Tracheae few or none. 



Characteristic bast fibers 152. Cinchona 



Raphides about 5 i^ long... 153. Cinnamomum 



Short sclerenchymatous fibers 154. Coffee 



Starch grains 7 to 20 m, compound. 



155. Sassafras 

 2. Sclerenchymatous fibers wanting. 



* Stone cells present. 



t Giving tannin reaction with ferric salts. 



Stone cells characteristic 156. Cacao 



Altered starch grains 157. Guarana 



Stone cells characteristic 158. Piper 



Thick-walled endosperm cells. 



159. Colchici Semen 

 ft Not becoming blue or green with ferric salts. 



Starch grains 4 to 12 ju 160. Aconitum 



Starch gi-ains 25 to 40 M.161. Physostigma 

 ** Stone cells wanting. 



Starch grains 7 to 20 /*. . . 162. Colchici Cormus. 



Altered starch grains 163. Guarana 



Numerous oil globules 164. Myristica 



Amylo-dextrin starch grains 165. Macis 



Few fragments of vegetable tissue. 166. Opium 



Starch grains 5 to 12 ;* 167. Podophyllum 



Odor characteristic 168. Chenopodium 



B. Starch grains few or none. 

 a. Containing calcium oxalate. 



u In rosette-shaped crystals. 



I. Small crystals in aleurone grains. 



With non-glandular hairs 169. Anisum 



Calcium oxalate 0.5 to i 1" 170. Carum 



Calcium oxalate 3 to 7 /* 171. Coriandrum 



Calcium oxalate i to 2 |U 172. Foeniculum 



