POWDERED DRUGS AND FOODS. 709 



'' Tracheae numerous. Continued. 



tt Starch grains 5 to 15 or 20 M 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 M long 147. Convallaria 



Raphides 6 to 8 M 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 M 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 m 160. Aconitum 



Starch grains 25 to 40 ya.i6i. Physostigma 

 ** Stofie cells wanting. 



Starch grains 7 to 20 M. . . 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 M 167. Podophyllum 



Odor characteristic 168. Chenopodium 



B. Starch grains few or none. 

 a. Containing calcium oxalate, 

 a In rosette aggregates. 



I. Small crystals in aleurone grains. 



With non-glandular hairs 169. Anisum 



Calcium oxalate 0.5 to i m 170. Carum 



Calcium oxalate 3 to 7 At 171- Coriandrum 



Calcium oxalate i to 2 m 172. Foeniculum 



