T. S. Hunt on the Chemisiry of Natural Waters. 47 
numerous analyses of rock-salt and of brines from various salif- 
erous formations, we shall find that chlorid of calcium is very 
frequently present in both of them; thus supporting the con- 
clusions already announced in § 24 with regard to the’ composi- 
tion of the seas of former geological periods. The oldest salif- 
erous formation which has been hitherto investigated is the 
chlorids of calcium and magnesium, as shown by the A 2 ses of 
Beck, and the recent and careful examinations of Goessmann. 
In the brines of that region the solid matters are equal to from 
14°83 to 16:7 per cent, and contain on an average, according to 
the latter chemist, 154 sulphate of lime, 0°93 chlorid of calci- 
um, and 0°88 chlorid wt magnesium in 100°00; the remainder 
being chlorid of so 
The nearly satebatedh} brines from the Saginaw valley in Mich- 
igan, which have their source at the base of the Carboniferous 
series, contain, according to my calculation from an analysis by 
Prof. Dubois, in 100-00 ‘parts. of solid matters, chlorid of calci- 
um 9°81; chlorid of magnesium 7-61; sulphate of lime 2°20; 
pe remainder being chiefly chlorid of sodium. Another well 
n the same vicinity gave to Chilton an amount of chlorid of 
i equal to 3°76 per cent.* In a specimen of salt manu- 
factured in this region Goessmann found 1°09 of chlorid of calci- 
um; and in two specimens of Ohio salt, 0°61 and 1:43 per cent 
of the me chlorid. The rock-salt from the Lias of Cheshire, 
o Nichol, contains small cavities, partly filled with 
air, and Some with a concentrated soluti tion of chlorid of mag- 
nesium, with some chlorid of calcium.’ 
* Goessmann, Report on the brines of Onondaga: Syracuse, 1862 and 1864. 
Also Report on the waranty = Salt Co. oe 1862. 
* Winchell : ae Journal, [2], xxxiv 
aoe ted by Bischof, Lehrbuch 1 ii. 1671. The results of the ae by Mr. North- 
of the Giince of Droitwich and Stoke in the same region (L. E. & D. Philos, 
Mag 4], os 32,) as pew ets by aoe ie no earthy chlorids whatever, and no 
carbonates d sulphates a 
lime. en oe whole of ‘na lime present in the water as being in the form 
of sulphate. If, however, we replace, in calculating these analyses, the carbonate 
