X CONTENTS 



CHAPTER II 



STEMS 



PAGE 



Herbaceous stems 233 



Cross-section, spigelia stem 233 



Ruellia stem 235 



Powdered horehound 237 



Powdered spurious horehound 237 



Insect flower stems 241 



CHAPTER III 

 WOODY STEMS 



Buchu stem . . 242 



Mature buchu stem 242 



Powdered buchu stem 245 



CHAPTER IV 



BARKS 



White pine bark 248 



Powdered white pine bark 250 



CHAPTER V 

 WOODS 



Cross-section quassia 254 



Radial-section quassia 254 



Tangential-section quassia . 258 



CHAPTER VI 



LEAVES 



Klip buchu 260 



Powdered klip buchu 262 



Mountain laurel 264 



Trailing arbutus 264 



CHAPTER VII 



FLOWERS 



Pollen grains 270 



Non-spiny-walled pollen grains 273 



Spiny-walled pollen grains 273 



Stigma papillae - 274 



