CIIKMICAL riUNCIl’LKS. 
131 
f tellurium dissolves. After it is cooled, the mass vcrr ronch Combiiunions 
. \ i- of lellurmin. 
esembles white enamel. This dissolves perfectly ui boiling 
vater, and this solution, as it grows colder, deposits a white 
low'der, half crystallized. This powder is a combination of 
he oxide of tellurium with kali ; that is to say, it is a tellurate 
)f kali. 3 his tellurate dissolves a little in cold water, and if 
,t is again dissolved in boiling water, it afterwards separates in 
he form of a powder in grains. It Ikh a sharp taste, and a 
little like metal, and acts weakly as an alkali on vegetable co* 
lours. 
The oxide of tellurium dissolves by digestion in ammonia, 
and this dissolution deposits, as it grows cold, a white jiowder, 
analogous to that just mentioned, and this powder is a tellurate 
of ammoniac. 
If, on a dissolution of muriate of lime or barytes, tellurate 
of kali was poured, this produced a white precipitate, quite in- 
■ soluble. These prec pitates are of tellurate of lime and of 
c barytes. 
The tellurate of kali precipitates sulphate of copper, with 
*a green colour, like a very beautiful emerald. This precipitate 
is the tellurate of oxide of copper (lelluras cupricus). When 
it is healed, it gives out its water of combination, and becomes 
' black. 'It is easily fusible, and in that state forms a black glass. 
IHealed on carbon before the bellows, it is reduced w'ith a 
(lively detonation, much like saltpetre, and afforded a pale red 
'JHetallic button (telluretum cupri). The tellurate of kali pre- 
ccipitates the sulphate of oxide of iron, w'ith a reddish colour: 
'Solutions of zinc, mercury, lead, silver, .and manganese, with 
a white colour. The quantity of tellurium of which I was 
in possession being very small, I was not able to produce suffi- 
cient from each of these combinations, to examine them more 
particularly 
To determine the capacity of saturation jiosssssed by the 
oxide of tellurium, considered as an acid, I have examined the 
composition of the /e/Zura/e q/* lead. On a solntion of neutral 
• acetate of lead, I poured tellurate of kali, and I collected the 
^precipitate thus produced. The portions of acetate of lead, 
which 
