XI 



CONTENTS. 



PAGE 



PREFACE . . . . vii 



ACKNOWLEDGMENTS . ..... ix 



ILLUSTRATIONS : 



Coloured Plates ........ xiii 



Black and White Plates .... xiv 



PART I. 



INTRODUCTORY. 



GENUS EUCALYPTUS : . . . . . . . . i 



Natural Order, Myrtaceas . .... 3 



Systematic Classification Adopted . ... . . 5 



Comparative Constancy of Specific Characters .... 7 



Hybridisation ........ 13 



Nomenclature . .... 14 



Geographical Distribution . . . . . . . 15 



Probable Evolution of the Species ...... 16 



Graphical Arrangement or Evolutionary Table . . . . 21 



PART II. 



BOTANY AND CHEMISTRY OF THE ESSENTIAL OILS 

 OF THE SPECIES. 



List of Species Investigated Arranged in Groups ... 25 

 Descriptions of the Species and their Oils .... 26-331 



PART III. 



TECHNOLOGICAL AND CHEMICAL. 



Table of Physical Constants and Constituents of the Crude Oils . 335-348 



Table of Average Yield of Oil from each Species . . . 349 



Alteration in Specific Gravity with Varying Temperatures . . 353 



Alteration in Refractive Index with Varying Temperatures . . 354 

 The Principal Constituents of Eucalyptus Oils .... 355-419 



Comparative Constancy of Oil Products . . . . 423 



Variation in Oils due to Age of Trees and Form of Growth . . 427 



Natural Material for Oil Distillation ... . 429 



Cultivated Material for Oil Distillation ..... 437 



Extraction of Eucalyptus Oil in Australia .... \/\^ 



Commercial Applications of Eucalyptus Oils .... 458 



