i10 Scientific Intelligence. 
bonates of magnesia react with the soluble salts of lime like the corres- 
onding carbonates of the alkalies. This is so far true that a solution of 
bicarbonate of magnesia rae carbonate of lime from a solution of 
chlorid of calcium, while the basic carbonate of magnesia separates the — 
carbonate of lime from its ton in carbonic acid. It results from this 
that when bicarbonate of soda is added to mixed and somewhat dilute. 
solutions of chlorids ot calcium and magnesium, the whole of the lime 
e 
than that stated by Bischof, since according to the determinations 0 
Bineau and my own, water may dissolve as bicarbonate more than one 
per cent of MgO, 
Thave found that saat we evaporate, at from 60° to 100° F., a solu- 
tion of bicarbonate of lime with an xeon of sulphate of magnesia, t 
of m 
in d 
and bicarbonate of soda, aided by a gentle heat, sects in the production 
of a crystalline anhydrous double carbonate of magnesia and soda, a 
ogous to dolomite, and I am led from some yet unfinished experiments 
to suppose that a similar reaction between the carbonates of lime and 
magnesia in the presence of carbonic acid may yield the double dattasnste 
of lime and magnesia, and thus explain the formation of magnesian 
limestone. 
7. Boron.—Prof. Q. Seria of Turin has published an elaborate me- 
vol. xvii. The form of part of the crystals, as before descri 
is dimetric, and either modified octahedrons or prisms. 
oar A monoclinic approaching closely to iaiineasleiey and the — 
he 3 toid boron is probably the same in a fine state. The point is dis- 
cussed ‘at considerable length in the memoir. 
II, GEOLOGY AND MINERALOGY. 
