CE Se Sey it oes 
, att 
T. 8. Hunt on Lime and Magnesia Salts. 49 
In conclusion, I can but express my earnest ee ‘that Prof. 
i 
South Pacific Ocean, as there are many reasons to believe that 
results deduced from researches made in that distant sgn. 
(which is so differently formed from our own) will do more to 
enlarge our knowledge of mundane and planetary pledions than 
those instituted upon the Atlantic shores. 
ART. mat —Further Contributions to the History fn ele and Mag- 
a Salts, I.—By T. Srerry Hunt, L F.R.S. 
Contents oF Secrions.—72-80, Review of previous investigations; 81-87, Hy- 
gett double carbonates 3 inc 8 magnesia; 88-95, Supersatarated solutions 
carbonates of lime an 96-101, Supposed decomposition of gypsum 
by dolomite; 102-110, ‘Artificial fcmatinn of dolomite; 111-112, Its occurrence 
in nature 
Ty 1859 I published in this Journal, (2), me 170, 865, the 
results of a series of investigations on some of the more com- 
mon salts of calcium and magnesium, in the course of which I 
paper. For the better understanding of what is to follow, [ 
shall first give a brief analysis of the principal facts detailed in 
the paper already referred ts of which this may be looked upon 
as a continuation. It wi erefore be convenient for the pur- 
pose of reference to ae the sections from $71, with which 
that pe concludes 
. In sections 1-5 it was shown that the gradual addition 
of a ata of bicarbonate of soda to water holding in solu- 
tion chlorids of magnesium and calcium, first precipitates the 
whole of the latter element as carbonate of lime, with but t one 
or two hundredths of adhering carbonate of magnesia, and there 
is thus obtained at length a solution holding only,chlorids of 
sodium and magnesium, with a portion of bicarbonate of i 
which, by evaporation at ordinary temperatures, is de 2 
Am. Jour. Sct.—Seconp Serres, Vou. XLII, No. 124. —JOEy, 1866, 
= 
