390 



Litelliaence and Miscellaneous Articles. 



refraction similar to that of Iceland spar. It dissolves entirely and 

 with effervescence in nitric acid ; before the blowpipe, per se, it first 

 decrepitates a little, then becomes brown, and is eventually reduced 

 to lime, but with more difficulty than pure limestone. 



In order to analyse it, M. Barruel heated it to redness, by which 

 it lost -te per cent, of carbonic acid and water ; it was then dissolved 

 in dilute nitric acid, and filtered to separate the insoluble gangue ; 

 the solution was treated with ammonia to separate the iron, and 

 carbonate of ammonia threw down carbonate of lime ; it was ascer- 

 tained to contain neither barytes nor strontia. The filtered liquors 

 were evaporated to dryness, then heated to redness in a platina 

 crucible, and an efflorescent residuum was obtained, which con- 

 verted into a nitrate was slightly deliquescent; it was carbonate of 

 soda. The analysis gave 



Carbonate of lime 70 



Carbonate of soda 14/ 



Water 9 7 



Peroxide of iron „ . , . 1 



Gangue 5 



99 7 



Or, according to M. Barruel, the mineral consists of 11 atoms 

 carbonate of lime, 2 atoms carbonate of soda, and 9 atoms water. 

 — Le Globe. 



CIRCULATED BY THE ASTRONOMICAL SOCIETY. 



Lunar Occtdtatiofts of some of the 'principal fixed Stars, for the months 

 of May and June 1830. Computed, for the meridian and parallel 

 of Greenwich, by Lieut. IV. S. Stratford, R.N., Secretary to the 

 Society. 



The angles are reckoned from the vertex of the moon's image, as 

 viewed ift an inverting telescope, towards the right hand, round the 

 circumference. 



