206 T. S. Hunt on the Chemistry of Natural Waters. 
The amount of silica which these waters contain does not in 
any case exceed one or two ten-thousandths, and it is well known 
that water at the ordinary temperature may dissolve very much 
more than this amount of silica, even in the presence of alkaline 
chlorids and of bicarbonates. 
of lime and magnesia, when they are in solution, it might be sup- 
posed that the silica in the above waters exists either in a free 
. 
paper, and which form a part of the series already mentioned 
ner described in § 56, whether separating immediately or by a 
siower process of gelatinization, always carries down with it, in 
combination, a few hundredths of magnesia. ‘ 
n these experiments, besides the carbonate of magnesia, sul- 
phate or ehlorid of magnesium was present; but the silicated 
natural waters now under discussion are alkaline from the pres- 
ence of carbonate of soda, and whatever partition of bases 
baden. But the silicates thus formed are but partially saer ee 
: : : Bogs 
the 
Journal [2], xii, 377) 
‘5 4 
in accordance with the above were observed in the 
