BY K. GREIOSMITH. 



333 



the odour of aromadendral, has a curve suggestive of a mixture 

 of aromadendral with an almost inert uil such as sesquiterpene. 



500' 



100 



15 30 



60 



120 



Text-fig.6. 



"'80 MINUTCS ?« 



Some Constituents of the Oils. 



Cuthbert Hall showed that of all the undiluted constituents 

 of the oils, aromadendral was the most active germicide. In 

 view of this, it seemed advisable to test the aldehyde in aqueous 

 dilutions. Aromadendral has a high boiling point (210 c -215°), 

 and largely remains behind when the crude oils of the "Mallees'" 

 — E. polybractea for example and of the "Box" group of Euca- 

 lypts are rectified by steam distillation. At the present time 

 there is no market for these residuals containing the aromaden- 

 dral, and they are usually thrown away. However, Mr. H. G. 

 Smith was able to obtain a small quantity of the residues, and 

 prepared for me about five c.c. of the aldehyde, which was 

 sufficient to test its properties. 



Piperitone, the ketone of the " Peppermint "' group of Euca- 

 lypts, was tested about the same time, and [ included the oils of 

 E. nova-anglica, the chief constituent of which is a sesquiterpene, 



