CD: Herries on retiring from his office as a ‘university ‘eather 
in the form of a book his meritorious” works on ozone and its action O1 
may here limit ourselves to mention the new book. 
i 
of a hospital, in which solutions of essential oils have had excellent effect. “Guided . at 
the results of numerous experiments, Wagner uses-a mixture of oils of cinnamon, 
cloves, Hucalyptus Globulus, myrrh, turpentine together with menthol, thymol, camphor | 
and balsam of Peru, dissolved in equal parts of linseed and cod liver oils. To this — 
solution, he adds 0.25 per cent. of iodine and 1 per cent. of said oils and stearoptenes — 
mixture, previously saponified with potassium hydroxide. Wagner has. observed that . 
the disinfecting power of essential oils is considerably increased by making their 
solution alkaline or at least neutral. The manufacture of the mixture as such, as 
potash soap and in “gelodurat” capsules has been reserved to a pharmacist, on the i 
alleged reason that the test of essential oils as to their purity was so difficult and the — 
saponification process so complicated. The preparations are sold under a fancy 
-name. As regards the difficulty of verifying the purity of the oils, the author seems _ 
to ignore that absolutely pure qualities can be obtained in the trade easily and BY | 
everybody. ee 
It would lead us too far to Hiphlie the numerous cases reported as having favourably 
been influenced by the mixture of essential oils, the quantitative composition of which 7 
Wagner does not indicate. 
Analytical Notes. 
In order to ascertain small quantities of essential oils in extracts, cordials, hea 
A. G. Woodman, R. T. Gookin and L. J. Heath’) have worked out a method depending 
upon the uSe of a -nephelometer *). If water be added to an alcoholic solution Be 
of oil nich are capable of reflecting the light. The amount of light retledhed by the, 2 
emulsion is compared with that of a standard of known concentration. The authors 4 
used a Duboscq a eee but slightly modified it. conceaae its construction, 2 
contain about the same amount of sugar as the cordial. If the Jones are Hee: 
coloured, the alcohol and essential oils must sometimes be ae off anata 
Lh a 
pert 
of one and the same substance that reflect an cabal amount of light. 
