METALLIC COMPOUNDS. 
39 
syrup, it deposits a crust of white powder, granulated asifStibiate of 
tending to crystallize, and very light. If the evaporation P otash - 
be continued to the consistence of honey, the mass congeals du- 
ring the refrigeration, presenting a white semitransparent pliable 
crust. When evaporated to dryness, it affords a white mass 
like enamel, brittle, and cracked in every direction. The neutral 
stibias kalicus is difficultly soluble in cold water, but is perfectly 
soluble in boiling water, without affording any deposition du- 
ring the cooling. When dried at the temperature of 4*100° 
(212° Fah.) and afterwards exposed to the fire, it looses its 
water of crystallization to the amount of 1 \i per cent, of its 
weight. Five grammes of stibias kalicus, previously ignited, 
being treated with nitric acid, were decomposed without the 
smallest disengagement of carbonic acid. As it is very difficult 
to separate the potash completely, I digested the insoluble 
part with new portions of acid until no more potash was by 
this means extracted. By this means I obtained 2 256 grains 
of nitrate of potash, which contain 1*04 grs. of pure potash. 
The stibic acid, being heated to redness, left 3 69 grs. of white 
oxide, equal to 3*96 p. of acid deprived of water. The stibias 
kalicus is therefore composed of 
Stibic acid 79’2 100 
Potash 20*8 26 
100 p- of stibic acid contain 27‘3 p. of oxigen j and 26 3 p. 
of potash contain 4471 or 4 471 X 6=26*826. It appears, 
therefore, that the stibic acid combines with a quantity of basse, ’ 
which contains one-sixth as much oxigen as the acid itself, be- 
cause we have found the same in the combination of the acid 
with water. If we compute the quantity of water found in 
the dry stibiate of potash, it will be seen that it contains nearly 
three times as much oxigen as potash j and it would become 
accurately so if we admit that the result is inaccurate to the 
precise extent in which it differs from the calculation. I must, 
however, observe, that in repeating the experiments on the 
composition of the stibiates, I have had various results, and that 
I cannot pretend that they are entitled to very great confidence, 
as far as relates to the accuracy of the numbers. The results, 
nevertheless, which I here communicate, have been deduced 
from experiments made with the greatest care ; and if I have 
been deceived, it must be ascribed to the great difficulty of 
pro- 
