CONTHNTS 



Page. 



Introduction 7 



Aroma of plants 9 



Nature of odors 9 



Localization of odors 11 



Development of aroma 12 



Extraction of aroma 16 



Separation of perfumes by solution 16 



Extraction with volatile solvents 16 



Extraction with liijuid fats 18 



Extraction with solid fats 19 



Separation of perfumes by expression 21 



Separation of perfumes by s-team distillation 22 



Apparatus 23 



Method of operation 26 



Handling of volatile oils 27 



Purification 27 



Separation, filtration, and drying 27 



Preservation 28 



Growth and harvesting of perfume plants 29 



Climate and soil 29 



Growth and cultivation 30 



Harvest 30 



Volatile oil plants of the United States 34 



Cultivated plants 35 



Wild plants 36 



Sassafras 37 



Wintergreen and sweet birch 37 



Canada fleabane 38 



Eucalyptus _ 38 



Monardas ' 39 



Pennyroyal 40 



Miscellaneous aromatic plants capable of cultivation 40 



Commercial aspect of the industry 43 



Value and consumption of volatile oils 44 



Imports and exports of volatile oils 45 



Present sources and cost of production of volatile oils 47 



Conclusions 47 



Index 49 



195 



5 



