180, On some Reactions of the Salts of Lime and Magnesia, 
bonate of strontia. The first contained some sulphate, with a 
large proportion of carbonate of soda, and the second, whic 
gave no trace of dissolved strontia, let fall by boiling a copious 
precipitate of magnesian carbonate. 
An analogous reaction between the sulphates of iron and zinc 
and bicarbonate of lime, resulting in the production of gypsum 
and carbonates of zinc and iron, has already been suggested by 
Monheim to explain the association of these minerals in a modern 
deposit from the waters of a mine. The experiments of Bischof 
have established the fact of such a decomposition for the sulphate 
of copper, as well as for the sulphates of zinc, and protoxyd of 
iron.—(Lehrbuch, ii, 1198-1202.) 
II, 
On the formation of the double carbonate of lime and magnesia. 
Karsten long since observed that dilute acetic acid, at tempera- 
tures below 82° F., readily dissolves carbonate of lime, but is 
. 
limits of error in Karsten’s process, 
poupsaies carbonate of 
ively effervescence, even when farther diluted. A pure crys 
mite 
