ORDER OF INVESTIGATION. 



The following is the order upon which the investigation of eacli species 

 has been undertaken, or at least every effort was made to carry it out in these 

 directions, the omissions being where material was unprocurable. This arrange- 

 ment holds throughout the work. 



I. Historical Botany of the Species. 

 II. Systematic Descriptions 



III. Leaves and Fruits: 



(fl) Economics. 



(b) Anatomy. 



(c) Chemistry of the oils. 



IV. Timber: 



(a) Economics. 



(b) Anatomy. 



(c) Chemistry of its products. 



(d) Forestry. 



V. Bark: 



(a) Economics. 



(b) Anatomy. 



(c) Chemistry of its products. 



VI. Illustrations, to aid in the study of the letterpress. 



