182 On some Reactions of the Salts of Lime and Magnesia, 
Jahresbericht, 1848, ii, 500). Desirous of verifying this observa- 
tion I have repeated the experiment of von Morlot, but have 
found that although the sulphate of magnesia is indeed com- 
pletely converted into carbonate, this remains for the most part 
in the form of magnesite mechanically intermixed with the 
excess of carbonate of lime, which may be separated by the aid 
of dilute acetic acid. 
. arts of pure precipitated carbonate of lime (two equi- 
valents) and 123 parts of crystalized sulphate of magnesia (one 
equivalent) were intimately mingled and exposed in sealed glass 
tubes for six hours to a temperature of 392° F. (200° C.) The 
resulting white tasteless mass was treated with cold dilute acetic 
acid which immediately caused a strong effervescence. en 
this action had subsided the residue was washed with cold water 
ing. The above experiment was however repeated with the ad- 
dition of a portion of water, but with the same result as before ; 
the carbonates not dissolved by acetic acid consisted of -242 of 
carbonate of magnesia and ‘008 of carbonate of lime. 
33. The experiments of de Senarmont have shown that when 
carbonate of nee is formed at a temperature of 150°-175° C. 
by the reaction between solutions of sulphate of magnesia and 
carbonate of soda, or by the decomposition of a solution of bi- 
carbonate of magnesia, it separates as a crystalline powder spat- 
ly soluble in acids and apparently identical with magnesite. 
—Ann. de Chim. et de Phys. fay, xxi, 148. It is evident from 
