the compounds of chromium. 195 
well as nitric acid, and nearly to as great an extent. Indeed 
this might have been inferred from several facts already 
known. I may mention, as an example, the property which 
it has of effervescing with tartaric acid, and giving out abun¬ 
dance of carbonic acid. 
Neither nitric acid, muriatic acid, iodine, oxygen, or chlo¬ 
rine, have any sensible action on the red liquid. 
When the red liquid is exposed to heat it gives out 
chlorine, and is gradually converted into a brown mass, solid 
while cold, but readily melting when heated. This brown 
matter deliquesces when left exposed to the air. When 
strongly heated it swells out, and at last assumes the form 
of a light grey slaggy looking matter. This in a strong red 
heat assumes a green colour, and is insoluble in acids. It 
resembles green oxide of chromium. I did not try whether 
or not it contained muriatic acid. 
After various trials, I employed the following method to 
determine the constituents of this red liquid. 
A cylindrical glass vessel, containing a few ounces of 
distilled water, was accurately balanced, and a quantity of the 
red liquid poured into it. The weight of this quantity was 
found to be 90*1 grains. By a little agitation, a complete 
solution was soon obtained, and the water assumed nearly 
the colour of sherry, A solution of carbonate of soda was 
gradually added till the acids contained in the liquid were 
saturated. The colour of the liquid had become darker, and 
upon applying heat a precipitate fell. This precipitate, after 
being collected on the filter, washed, and dried, weighed 1*37 
grain. By ignition it glowed, and the weight was reduced to 
O'71 grain. It was green oxide of chromium. 
