SOME NEW ENGLAND EUCALYPTS AND THEIR ECONOMICS. 269 



Oils. — The portion devoted to the determination of the 

 volatile oils of the species of Eucalyptus included in this 

 paper, embraces two sections: (1) The investigation of new 

 oils obtainable from the leaves of E. Andrewsi, E. acaciae- 

 formis and E. campanulata; and (2) results of investigations 

 into oils of species not examined previously from this 

 locality. The results obtained by this additional chemical 

 evidence go to support the fact that there exists a remark- 

 able constancy in the chemical products of identical species 

 of Eucalypts, which has enabled an auxiliary method of 

 discrimination between species to be evolved, one which in 

 conjunction with botanical and physiological features 

 assists in determining the relations between members of 

 the several groups and allied sections of this large class of 

 Australian vegetation. The study, in this instance, has 

 been devoted largely to the characters of the oils derived 

 from species yielding products which may perhaps be 

 considered of an anomalous nature, so far as ordinary 

 Eucalyptus oils are concerned. The economic side of this 

 question, too, cannot be ignored, especially in view of the 

 prominence Eucalyptus oil has lately reached. The species 

 dealt with in this section are E. laevopinea, E. nova-anglica 

 and E. Bridgesiana. Prior to the discovery of the promin- 

 ence of the terpene pinene in certain Eucalyptus oils, it 

 had been generally recognised that the terpene phellandrene 

 was the most abundant product of their terpene oils. While 

 this is true, so far as the species of one large group is con- 

 cerned, yet, it has been possible to show that not only does 

 the terpene pinene occur in abundance in the oils of some 

 Eucalyptus species, but that both active modifications are 

 obtainable from different trees. Eucalyptus laevopinea may, 

 probably, often have been considered by botanists as E. 

 macrorhyncha, the " Red Stringy bark " of Southern New 

 South Wales, or perhaps E. pilularis, but from a com- 

 mercial point of view alone this supposition cannot be 



