228 ON THE ESSENTIAL OIL OF MUSTARD. 
whether hypochlorous acid or pure chlorine. With this 
view I placed at the end of the tube from which the gas 
was allowed to issue a coil of iron wire in order to deter- 
mine whether the gas was hypochlorous acid, as in such 
case an insoluble oxide of iron would be formed, but in- 
stead of this the soluble chloride was produced, known to 
be such by its giving with solution of nitrate of silver the 
usual curdy white precipitate, soluble in strong solution of 
ammonia but insoluble in nitric acid. I then placed a coil 
of silver wire in the end of the tube in a similar manner. 
After the action went on for some time, a white curdy mass 
was formed, soluble in strong solution of ammonia, but in- 
soluble in nitric acid — chloride of silver. 
The united results of both these experiments prove the 
gas eliminated to be pure chlorine, so that it settles the 
question in favor of Milloivs theory, — that it is a compound 
of one atom of bicarbonate of soda in combination with one 
atom of oxy-chloride of sodium in solution. 
Ibid, from Dublin Hospital Gazette. 
ART. LXVI. — ON THE CONVERSION OF THE ESSENTIAL OIL OF 
MUSTARD INTO THE ESSENTIAL OIL OF GARLIC. 
By Charles Gerhardt. 
The artificial production of substances which are gene- 
rated in the process of vegetation or in the animal economy 
becomes more and more frequent as organic chemistry ad- 
vances. I shall now draw attention to one which seems to 
me to merit attention. 
The essential oil to which garlic owes its characteristic 
odour has been recently analysed by M. Wertheim, and 
