16 
a clean tube and heated to 120° C. (i.e, about 2° above the 
boiling point of chromyl dichloride) in a current of dry car- 
bonic acid gas until its weight appeared constant. The fol- 
lowing determination of the amount of chlorine contained in 
the volatile portion shows that it is simply chromyl dichlo- 
ride which has remained undecomposed. 
0*8741 gram liquid chloride gave T6458 grams silver chloride. 
Calculated for Cr0 2 Cl 2 Found. 
45-7% 46-5% 
The solid substance dried in the manner above described 
appears as a black uncrystalline powder, which when ex- 
posed to the air rapidly deliquesces to a dark reddish brown 
syrupy liquid which smells of free chlorine. When thrown 
into water it quickly dissolves, forming a dark brown solu- 
tion which on standing also evolves chlorine. In nitric 
acid solution hypochlorous acid appears to be produced. In 
strong hydrochloric acid the substance dissolves with a dark 
brown colouration, and on boiling the solution chlorine is 
evolved, the liquid becomes greenish yellow, and ultimately 
changes to the dark green colour peculiar to a solution of 
chromium sesquioxide in hydrochloric acid. When thrown 
into dilute ammonia chromic acid is dissolved, together with 
all the chlorine, and a precipitate is formed possessing the pro- 
perties of the chromate of chrome sesquioxide (Cr 2 0 3 Cr0 3 ) 
described by Storer and Eliot. Upon this decomposition is 
based the method which I have employed for the estimation 
of the amount of chlorine contained in this body. The 
weighed quantity of the substance was treated with very 
dilute ammonia, the solution boiled for a few minutes, fil- 
tered, the precipitate well washed by hot water, an excess of 
nitric acid added to the filtrate, and the chlorine precipitated 
by the addition of silver nitrate. Two determinations of 
chlorine carried out in this manner on preparations made at 
different times gave the following results. 
