Herbaceous stems . 
Cross-section, spigelia stem 
Ruellia stem 
Powdered bend” 
CONTENTS 
CHAPTER II 
STEMS 
Powdered spurious horehound 
Insect flower stems 
Buchu stem . 
Mature buchu stem 
Powdered buchu stem . 
White pine bark 
Powdered white pine bark 
Cross-section quassia 
Radial-section quassia . 
Tangential-section quassia 
Klip buchu . 
Powdered klip igichu 
Mountain laurel 
Trailing arbutus 
Pollen grains 
CHAPTER III 
WOODY STEMS 
CHAPTER IV 
BARKS 
CHAPTER V 
WOODS 
CHAPTER VI 
LEAVES 
CHAPTER VII 
FLOWERS 
Non-spiny-walled pollen grains 
Spiny-walled pollen grains 
Stigma papille . 
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