172 A. R. PKNFOLD. 



these bodies will find suitable commercial application, if 

 obtainable in sufficient quantity. As the investigation of 

 the oils of the Leptospermum proceeds evidence is not 

 wanting that these interesting constituents abound 

 therein. 



Very good agreement is shown in the results obtained in 

 the examination of the various oils separated from the 

 leaves collected in different districts. Tt will be observed 

 that no solid eudesmol was detected in the oils obtained 

 from material collected in the Lane Cove and Kuring-gai 

 districts of Sydney; the sesquiterpene alcohol being a liquid, 

 which it was impossible to isolate in a state of purity owing 

 to the large amount of sesquiterpenes present. The fact 

 that the principal sesquiterpene appears to be eudesmene 

 justifies the author, especially in view of a similar experi- 

 ence with oils from other species of Leptospermum, and an 

 analogy in the Eucalyptus oils, in considering it to be either 

 the so-called liquid form of eudesmol, or a very closely 

 related alcohol. 



It was surmised that probably altitude or soil conditions, 

 apart from that of season, had a bearing upon the produc- 

 tion of solid eudesmol in the plant, especially as Lane Cove 

 and Kuring-gai are but 200 feet and 700 feet respectively 

 above sea-level, whilst Hill Top is 2,030 feet. In order to 

 decide the question, a locality was selected on the Blue 

 Mountains, about an equal distance from Sydney as Hill 

 Top and of high altitude. A collection of material was, 

 therefore, made from Blackheath, which is 3,495 feet above 

 sea-level, and seventy-five miles from Sydney, with the 

 result, as shown later, of the presence of considerable solid 

 eudesmol. 



