C. A. Goessmann on the Onondaga Mineral Springs. 369 
an examination proved that only 0°0246 grams of oxyd of cal- 
cium, equal to 0:0470 chlorid of calcium were left in the solu- 
tion; while the missing lime had been replaced by magnesia: or, 
in other words, the chlorid of calcium, originally in solution, 
had been replaced by chlorid of magnesium. The excess of 
carbonate of magnesia employed for the operation, as left upon 
the filter, contained 06480 grams carbonate of lime (=0°7193 
chlorid of calcium), The mutual decomposition is therefore, 
under proper circumstances, quite rapid and complete. There 
tioned, I repeated the experiment, substituting Onondaga brine for 
a simple solution of chlorid o i : 
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hagnitude is in a less degree a matter of time than of the quan- 
tities in which they happen to mix. As carbonic acid gas in- 
creases the solubility of a number of compounds here under con- 
Sideration, its presence either as gas, or in the form of a bicart 
nate, must, for that very reason, be highly favorable for bringing 
about some of the changes above described. ce 
