270 Klapruth on the Cheniical Analj/sis 



caustic soda, evaporated to dryness, and ignited. Tiie result- 

 ing mass tinged the water which was affused of a pale-green ; 

 dissolved in muriatic acid, evaporated to dryness, and again 

 treated with very dilute muriatic acid, silica remained, which 

 after being heated red-hot, weighed 52.5 grains. 



b. The muriatic solution was saturated by caustic ammonia, 

 which caused a bulky brown precipitate ; this being separated 

 by filtration, a clear colourless solution was obtained, which, 

 by the addition of carbonate of soda, yielded 16.5 grains of 

 carbonate of lime, —9 grains of lime. 



c. The precipitate by ammonia was transferred while yet 

 moist, into a boiling solution of caustic potassa ; a portion 

 was dissolved, and the remainder collected upon a filter. Mu- 

 riate of ammonia was added to the alcaline solution, which 

 threw down 7.25 grains oi alumina. 



d. The remaining portion was dissolved in dilute nitro- 

 muriatic acid ; to this solution carbonate of soda v/as added, 

 to throw down oxide of iron, amounting to 16.25 grains. 



e. The residuary liquid was boiled, and completely decom- 

 posed, with excess of carbonate of soda; carbonate of magne- 

 sia was thus thrown down, which yielded, on ignition, 12.5 

 grains of magnesia. 



C. 



lUO grains of levigated augite were fused with 500 grains 

 of nitrate of baryta ; the resulting mass was powdered, mixed 

 with water, neutralized by sulphuric acid, and the precipitate 

 thus formed separated upon a filter. The clear liquid was 

 precipitated by ammonia, the precipitate removed, evaporated 

 to dryness, and the dry salt ignited ; as this contained sul- 

 phate of magnesia, it was again dissolved and decomposed by 

 acetate of baryta ; the filtered liquid was evaporated, and the 

 residue ignited ; there remained a blackish matter, weighing 

 1.25 grains, which was washed, to separate the charcoal 

 resulting from the combustion of the acetic acid ; the washings 

 afforded a portion of carbonate of potassa, equivalent to 

 about half a grain oi potassa. 



100 parts, therefore, of this lamellar augite consist of 



