112 Scientific Intelligence. 
15. Cuemicat GroLocy :—Luperiments on the deporiment of Carbonate 
of Lime at a high temperature, both with fluxes and alone; by G. Rose. 
—In a recent paper on the heteromorphous states of carbonate of lime, 
presented to the Berlin Academy of Sciences, Rose gives — the following 
will be completely dissolved without effervescence. e fused mass is 
allowed to cool and a portion of this is placed in water at the ordinary 
temperature, it _ —— pass into solution leaving a pulveruleut 
residue of carbonate of lime. An examination of this residue shows it to 
consist of an aggregate of — sete ne after 24 hours—some- 
times in | and converted either into 
meeuedls Se alten Ricnaichiediots, or rhombohedral groups of 
calcite. 
I. If another portion of the mass is thrown into boiling hive rg 
for some time, and the residue examined under the microscope, it 
found to consist of small prisms of aragonite, with occasional et bli 
dral crystals of calcite, but none of the above mentioned globules; if 
the residue be allowed to remain under water, the prisms after a time 
are converted into minute rhombohedrons of calcite. Thes nomen 
are then identical with those obtained when a m ga of the solutions 
of carbonate of soda and chlorid of calcium is made, as long since de- 
scribed by ee author in his first article on this welsjact; see Pogg. Ann., 
(1837), mets 54. 
IIL. Instead of adding — of — to the fused carbonates, pow- 
dered ct, ’ rhombohed ts of calcite, chalk or aragonite 
may be s ; these dissolve ais ey, without effervescence in 
the flux a an the same results as above mentioned when the fused 
mass is treated with hot or cold water. 
IV. Oxalate of lime at a low red heat after losing the water it contains 
is LB Me into carbonate of lime with evolution of carbonic oxyd; un- 
der the micrdscope the product appears to consist of minute amorphous 
— similar to those obtained above, and these remain anged 
when placed in water, even when boiled the globules still vetiti “halt 
amorphous form—they are not converted into calcite 
From the experiments thus far described it will be seen that rhombo- 
directly produced when chalk and compact limestone were exposed to a 
igh temperature under great pressure. The author assisted by Mr. War- 
* Oxalate of lime is en and when converted by heat into carbonate, this 
character still remains. 
