the compounds of chromium. 201 
left o'25 grain of a brown matter, which did not glow when 
heated to redness. 
The filtered liquid was very dark-coloured, but not muddy. 
Its opacity was not destroyed by very large dilution with 
water. It reddened vegetable blues slightly, and had the 
sweet taste which characterizes muriate of chromium. 
Being mixed with ammonia, abundance of green flocks 
fell, which weighed after ignition 10-22 grains. 
The filtered liquid was mixed with nitrate of barytes as 
long as any precipitate fell. The chromate of barytes weighed 
after ignition 27-77 grains, equivalent to ii-io8 grains of 
chromic acid. 
The residual liquid being precipitated by nitrate of silver, 
the chloride of silver obtained weighed after fusion 23*6 
grains, equivalent to 5-819 grains of chlorine. 
Thus the constituents of the 31 grains 
analysed were 
Brown insoluble matter 
0-25 
Protoxide of chromium 
10-22 
Chromic acid - - - 
11*108 
Muriatic acid - _ - 
5*980 
Loss, considered as water 
3-442 
31 
These numbers are not precisely in atomic proportion. 
There is a slight redundancy of muriatic acid or clilorine, 
amounting to very nearly half a grain. The constituents 
approach 
MDCCCXXVII. 
Dd 
