,553 
termed triple Prussiates. 
with muriate of ammonia, also by mixture with nitrate of per- 
oxide of iron ; when mixed with five times its weight of hy- 
peroxymuriate of potash it explodes, either by heat, friction, 
the contact of sulphuric acid, or by the electric spark. This 
explosion is very loud if it take place in a confined space, as in 
tubes. 
Of per-oxide of copper, is best formed by adding sulphu- 
retted cliyazate of soda to sulphate of copper, both in a pure 
state ; it is then in the state of a bright pea-green liquid, to 
which if any deoxidating substance be added, such as sulphu- 
rous acid, an alkaline sulphite, or the salts of protoxide of tin 
or of iron, then the sulphuretted chyazate of protoxide of 
copper is immediately produced, and precipitates in its usual 
form as a white powder. 
Of protoxide of lead, a soluble salt, the forms of whose 
crystals, I am inclined to believe, are obtuse rhombs; in a 
moist atmosphere these crystals slowly deliquesce. 
Sulphuretted chyazate of protoxide of iron, a colourless salt, 
very soluble. 
Sulphuretted chyazate of per-oxide of iron, a salt of a beau- 
tiful crimson colour, deliquescent, and not obtainable in a solid 
form without great precautions, and a particular process, which 
consists in exposing it to an atmosphere artificially dried. 
The sulphuretted chyazates of the following metallic oxides 
appear, by my experiments, to be all very soluble, viz. oxides 
of tin, bismuth, manganese, zinc, cobalt, nickel, palladium, 
uranium, molybdenum, and chromium. 
The two sulphuretted chyazates that I have analysed are, 
that of protoxide of copper, and that of barytes. 
