182 J. M. Ordway on Waterglass. 
_ liquid containing 10 p. c. of KSn,.,, became opaque with its own 
weight of a2 p.c. solution of Nad. A much less quantity of 
sulphate of soda sufficed to produce the same effect. A soda 
salt therefore affords a test of the presence of metastannate in a 
stannate of potash solution, but the liquors must not be too con- 
centrated. 
Fremy says that stannate of potash is precipitated from its 
solution by almost all soluble salts, and even by salts of potash, 
a, and ammonia. He must have operated with liquors that 
had been kept too long and had thereby become contaminated 
with metastannate; for my own experiments afford no confirm- 
melange on peut-étre une combinaison de stannate, et de meta- 
stannate, ete,’’ 
PF EHO | ° . ° , si eae , z 
est ainsi que j’avais été conduit 4 représenter l’acide meta- 
stanni j re actuellement 
d 
The precipitate was ari 
But it can hardly be pos 
