A CONTRIBUTION TO THE CHEMISTRY OF THE PHELLANDRENKS. 179 
reaction for the diagnosis of phellandrenes in essential oils, 
as well as possessing a much more general interest in con- 
nection with the chemistry of the terpenes concerned. 
It may be added in this place that certain physical and 
chemical agencies have been found to-exert a pronounced 
acceleration on the velocity of mutarotation. Further, 
the P-nitrite of l-o-phellandrene appears to exhibit some- 
what similar changes. The enquiry is also being extended 
to nitro-c-phellandrene. These observations will be 
recorded fully in subsequent publications, together with 
the results ofa comparative physical and chemical examin- 
ation of phellandrenes obtained from other sources, includ- 
ing various species of Kucalyptus and allied Australian 
genera. 
We are continuing the detailed investigation of the 
whole field of work indicated in this paper. 
