196 TS. Hunt on the Chemistry of Natural Waters. 
in the proportion 12: 750. When however another portion was 
boiled down to one-sixth, the precipitate was found to be pure 
after a time Spontaneously decomposed even in closed vessels, 
with deposition of a portion of ervstalline hydrated carbonate 
of magnesia; another portion remains in solution, together with 
chlorid of magnesium, but is precipitated by ebullition, (This 
Journal [2], xxvii, 173.) 
55. Bicarbonate of magnesia and chlorid of calcium, when 
brought together in solution, undergo mutual decomposition with 
separation of carbonate of lime if the solutions are not too dilute. 
At the ordinary temperature and pressure, water saturated with | 
carbonic acid will not hold in more than about one gram of car- 
bonate of lime to the liter (1: 1000); equal to only 0°88 grams of 
hale water is well known to be much less, and is, according to 
ineau, equal to 1: 30,000 or 1: 50,000.) Weshould not there- 
e 
explain 
No. 7), hold 
ist In the presence of sulphates and 
c1um magnesium. Reserving for another 
: deseription of the details of these investigations, I 
we > the results obtaine 
tained. 
f memoir on the salts of lime and magnesia pe : 
$ 
in 1859 (in this Journal [2], xxviii, 171), it was shown tha by the 
- addition of bicarbonate i asd oda to a solution holding chlorids of 
