354 J. M. Ordway on Watergiass. 
bodies than the protoxyd, we have little to fear. In fact were 
the dunging bath free from the sesquioxyd to start with, it 
could not remain so, as it is continually receiving from the cloth 
. 
little service further than to retain the oxyds in the active state. 
soda. A — of it was found to contain, besides the silicate, 
not what. 
Another absurd proposition which has been advanced by those 
wishing to monopolize the manufacture, is that a silicate contain 
ing an admixture of sulphate and chlorid, is superior to the pure 
article. There can be no reason assigned why it should be 8% 
and as to experience, so far as I can learn, pure well worked we 
terglass has always given quite as good satisfaction in dungis 
calico, as either the arseniated silicate, or the uncertain, half made 
product prepared from impure soda ash. It has never y' ¢ 
ascertained what is the precise reaction between the silicate 0 
soda or lime and the mordant on the cloth. There can be little 
. doubt that a silicate of alumina or iron is formed, and it 1s not 
improbable that this retains a small amount of lime or soda. 
r, N. H, August, 1861. 
* Wagner's Jahresbericht, i, pp. 339, 340. 
