192 T. 8. Hunt on the Chemistry of Natural Waters. 
E. Waters holding chiefly sulphates from decomposing pyrites ; copperas | 
Jum water: 
and alum 8. 
F, Waters holding free sulphuric or chlorhydric acid. 
proportions of earthy chlorids than the first class, and are henceless 
bitter to the taste, 
IIL. Saline waters which contain, besides chlorid of sodium and the ca 
onates of lime and magnesia, a portion of carbonate of soda 
3; Waters which differ from the last in containing but a small propor 
tion of chlorid of sodium, and in which the carbonate of soda pre 
dominates. The waters of this class enerally contain much less 
solid matter than the three previous classes, and have not a very 
marked taste until evaporated to a small volume, when they will be 
found, like the last, to be strongly alkaline. 
Of these four classes, I corresponds to the division D, and IV 
to C, while IT and III are regarded as resulting from the admix — 
ture of these in varying proportions. Sulphates are somite 
present in these waters, but never predominate; in their absent iH 
salts of barium and strontium are often met with. The cblom 
ue generally, if not always, associated with bromids and pee 
Small quantities of potassium salts are also present, while bora ff 
phosphates, silicates, and small portions of iron, manganes¢ 
alumina are generally present. These various waters are 0c 
sionally sulphurous, and those of the last three classes may 
impregnated with carbonic acid 
V. The fifth class includes acid waters remarkable for containing * larg a 
magnestty ii 
Proportion of free sulphuric acid, with sulphates of lime, 
portions of iron, and alumina. These waters, which are charac 
ized by their sour and styptic taste, generally contain some 
etted hydrogen, 
P E 
slp 
| 
; 
Ey, Ry eee ae Oe A= AE 
