390 Miscellaneous Intelligence. 



riatic acid, and evaporated to dryness to separate the silica; then fil- 

 ter and wash the silica with weak muriatic acid, and precipitatingthe 

 solution by ammonia, boil and separate the oxide of iron. Evaporate 

 the ammoniacal solution until its blue colour changes to green, put 

 in a few drops of hydrosulphuret of ammonia, and collect on a filter 

 the black precipitate of hydrosulpliuret of nickel. After having eva- 

 porated the solution until colourless, precipitate the lime by oxalate 

 of ammonia, and the magnesia by caustic potash. 



The second process, by acid, is intended to determine the quan- 

 tity of sulphur and alkali only. To one part of the aerolite add 

 sixteen parts of muriatic acid, diluted with an equal volume of 

 water; heat this mixture in a tube or flask, conducting the gas libe- 

 rated into a solution of acetate of lead or copper ; continue the heat 

 until no more sulphuretted hydrogen is liberated : then collect, 

 wash, dry, and weigh the sulphuret formed. Filter the muriatic 

 solution, pass chlorine through it to convert the iron into peroxide, 

 precipitate the iron by ammonia, evaporate the solution to dryness, 

 and heat it strongly. Any residue must be dissolved in water, and 

 tested for alkali by solution of pure j)latina. 



The stone first examined fell June '60, 1820, at Lexna, near Du- 

 nabourg, at the mouth of the Duina. It resembled most other 

 aerolites. When pulverised it gave about a fourth of its weight of 

 brilliant globules, attracted by the magnet, and dissolving in weak 

 muriatic acid, with the evolution of sulphuretted hydrogen; 100 

 parts containing the globules gave 



Oxide of iron 40 



Silica . ..... 34 



INIagnesia 17 



Sulphur 6.8 



Alumina ...... 1 



Nickel 1.5 



Chrome ....... 1 



Lime 0.5 



Traces of copper and manganese 

 The second atirolite fell 30th March, 1818, at Zaborzyca, in 

 Volhinie. It was easily pulverised, and did not contain the globules 

 found in the preceding stone: 100 parts gave 



Oxide of iron ..... 45 



Silica 41 



Magnesia ...... 14.9 



Sulpluir 4 . 



Lime ...... 2 



Nickel 1 



Alumina 0.75 



Chrome 0.75 



Traces of manganese 



109.40 



