T. S. Hunt on the Chemistry of Natural Waters. 183 
the vicinity of the lake of Laach, where the alkaline waters 
studied by Bischof occur.’ The same thing is met with in many 
other localities of such springs, among which may be mentioned 
the region around Saratoga, where saline waters containing car- 
bonate of soda, and highly charged with carbonic acid, rise in 
abundance from the Lower Silurian strata; but farther. north- 
well to recall the solvent power of pure water on alkaliferous 
silicates, as shown more especially by Bunsen, and also by 
mesotype, comparatively Jarge amounts both of silica and alka- 
lies, (Damour, Ann. Chem. et Phys., [8], xix, 481. 
strata, both in the solid state and in aqueous solution, and for 
the most part of marine origin. In order to form some concep- 
tion of the amount of saline matters which may be contained in 
‘dissolved state in the rocky strata of the earth, we have made 
humerous experiments to determine the porosity of various 
ks; some few of the results of which may here be noticed, 
Fragments of the rocks were dried at a heat of 150° to 200° F., 
inacurrent of dry air until they ceased to lose weight. They 
were then soaked in distilled water, and kept under it for many 
hours beneath an exhausted receiver. When thus saturated 
they were wiped from adhering water, and weighed; first in air 
to determine the augmentation of weight from absorption, a 
Poted ; specimens .... 226—2-71 
dam formation, (sandstone) z . oT. 6-94—9 35 
= e - an 
Caleiferous “ (eryst, dolomite) : g far eee 
Chazy “  (argill. limestone) Te ng Sob toed 
Trenton “ (gray crys. “ cia et ee 0 32 
3 “(black impalp. “ ) Aaa . re el 0 
Bidens Ri “(black shal gigs 3 ane ® 4 
tee ver bed ACEOUS SNAICC} eee ee FN ee et Le aut at ale ase 
nn Rate ape Bog eemeieear atte 
tap “  (eryst. dolomite) ee Vien aot ee 
‘agara “(impalpable “ ) ee pe dated 
7 Bischof, Lehrbuch, i, 857-368. 
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