184 On some Reactions of the Salts of Lime and Magnesia, 
acid of 15 p.c. at 60° F. No action was apparent even after 
some minutes, but with a heat of 120° F. a gentle effervescence 
ensued. When this ceased there remained a flocculent residue 
equal to 15°7 p. c., and the undissolved portion gave carbonate 
of lime 37°6, carbonate of magnesia 62° 
rtion of ‘500 grm. of the same carbonates was now diges- 
ted with diliste acetic acid at 60° F. for several hou The 
soluble portion contained carbonate of lime 40-0, and pera 
of magnesia 60-0, while the undissolved residue equalled 22-4 
p- t effervesced freely with warm somewhat dilute hydro- 
chloric acid and left a silicious residue of ‘032 grm., while the pe 
solved portion gave ‘007 of carbonate of lime and ‘060 o 
bonate of magnesia. 
6. In another experiment with carbonate of lime and chlorid 
of magnesium, the . of carbonates as extracted from the 
tubes contained 24-4 magnesian carbonate. This was 
treated with acetic acid v ‘60° F., and the digestion continued, for 
senna omic g y 23°6 per cent. These experiments 
eit double 
70 p. ¢ c. of carbonate of lime, are mixtures of a double pas 
ate of lime and magnesia with a less soluble carbonate of magne- 
sian, from which the double salt may be partially separated ms 
the prolonged action of acetic acid at ordinary temperatures, a5 
own in § 35. 
37. In the experiments § 384 and §36 it appears that the car- 
bonate of magnesia unites, at the moment of its formation, with 4 
portion of carbonate of lime to form the double carbonate. It re- 
Mained to be seen whether mixtures of the two carbonates would 
combine directly, and experiments were made with the Styrian 
Ww 
C. with a dilute solution of chlorid of calcium. No combination 
took place, and the carbonate of lime was afterwards completely 
removed from the magnesite by cold dilute acetic aci 
ae dense insoluble magnesite, as might be conjectured from 
its occurrence in the products of the previous experiments, eX 
hb none of wnat aptitude to combine with carbonate of lime 
which seems a the newly formed magnesian car 
to this sparingly soluble condition, 4 
