197 
the compounds of chromium. 
Green oxide of chromium 
0*71 
Chromic acid 
59'34 
Chlorine - - - 
40*54 
-- 
100*59 
The weight of the products is more than 10 per cent, greater 
than that of the red liquid subjected to analysis.* But 59*34 
is to 40 54 as 6*5 to 4*4. I was induced from this to consider 
the red liquid as a compound of 1 atom chlorine and 1 atom 
chromic acid ; and the following experiment was made to 
verify this supposition. 
15* 3 2 grains of the red liquid were dropt into a quantity of 
distilled water, and 50*15 grains of crystallized carbonate of 
soda were dropt into the bottom of the vessel containing the 
liquid. The solution of this salt took place slowly, and the 
carbonic acid escaped gradually, and without carrying with 
it any perceptible quantity of chlorine, as is apt to happen 
when a solution of carbonate of soda in water is poured into 
the dilute red liquid. The liquid being heated and agitated, 
to expel the carbonic acid gas, a slight flocky precipitate 
fell, and the liquid was found quite neutral ; for it neither 
altered the colour of litmus nor cudbear paper. 
The reason why 50*15 grains of carbonate of soda were 
used was this : if the red liquid be a compound of 
1 atom chromic acid - - 6 5 
1 atom chlorine - - 4*5 
11 
* This augmentation of weight was occasioned by using a carbonate of soda, 
not quite free from common salt ; and by adding the alkali slightly in excess. 
From these two causes there was an excess of chloride of silver, and the chromate 
of barytes was mixed with a little carbonate. 
