204 TT. S. Hunt on the Chemistry of Natural Waters. 
part of which the vig 
See Bischof, Chem. Geology, i, 5; who remarks that Lowig 
each oS 
Pfiffers. For further examples of this kind see Lersch, Hy in 
hemie, page 338. The carbonic acid in the water of be per ee 
according to him, not sufficient to form biearbonates unless t 7 
silica present posed to be combined with a portion of yore 
while in the alkaline thermal spring of Bertrich, according to : 
analysis of Mohr, a similar deficiency of earbonie acid exists; 
leading to the conclusion tha 
‘ magnesia, as described in $56, i a 
interest in this conzection ; since it at once affords an explana: 
tion of the nature and origin of all such alkaline waters, ee | 
Geficient in carbonic acid, as contain earthy sulphates and — 
§ 68. Tt was found that the waters of Chambly in 1864, and 
of the Sulphur spring of Caledonia in 1865, gave with lime- 
_ Water a precipitate which was soluble in an excess of these min 
eral waters, but to a much less extent than in the acidulous 
ne water from the High-Rock springs of Saratoga. 
__ latter, which contains bicarbonate of soda, and is highly charge 
oo with carbonic acid, turns to a wine-red the blue color of litmus 
