T. S. Hunt on the Chemistry of Natural Waters. 45 
this respect are related to those of the second class, while they 
still show a large predominance of earthy chlorids. * 
| $37. The waters of the above table contain, besides chlorid of 
| sodium and a little chlorid of potassium, large quantities of the 
| chlorids of calcium and magnesium, amounting together, in sev- 
| eral cases, to more than one half the solid contents of the water. 
Sulphates either are absent, or occur only in small quantities, 
n same is true of earthy carbonates. Salts of baryta and 
Pp eam 
Silurian strata from which these saline springs issue; and the 
presence in many of the dolomitic beds of the Calciferous sand- 
ted 
| From the proportions of chlorid of sodium, varying from. 
about one-third to more than two-thirds of the solid contents of 
formation m 
like compositi 
