Xvi LIST OF ILLUSTRATIONS. 
NO. PAGE 
168. Formation of an oil-gland of Dictamnus Frawinella, : 250 
169-175. Formation of intercellular spaces, : ‘ 252, 253 
176. Balsam-passage (oil-space) of Radix Inule, : . 253 
177. Rhizoma Arnice, central portion of an oil-space, . ; 253 
178. Radia Sumbul, longitudinal section from the bark, : . 254 
179. A coniferous leaf, transverse section through an oil-canal, . 255 
180. Pinus silvestris, transverse section from the wood, ~ . 256 
181. Pistacia Lentiscus, transverse section of the bark, . ‘ 256 
182. Arnica montana, portion of a transverse section of the rhizome, 257 
183. Fructus Foeniculi, longitudinal section of an oil-passage, . 259 
184. Fructus Conii, transverse section, . - i Q . 260 
185. Fructus Conii, longitudinal section through coniine layer, . 261 
186. Cinnamon bark, elements isolated by maceration, é . 270 
