50 Mr Connell's Description and Analysis of 



solution, and a minute quantity of sulphuret of manganese got, 

 which, by treatment with muriatic acid, and precipitation with 

 potash, yielded .01 of red oxide of manganese, or .009 of prot- 

 oxide •, leaving 1 1 .73 of carbonate of lime, equivalent to 6.602 

 of lime. 



h, The liquid separated from carbonate of lime in g, was eva- 

 porated to dryness, and the ammoniacal salt driven off by heat. 

 A small quantity of a white saline residue remained, which, ig- 

 nited, weighed .39. This residue, redissolved in water, left .07 of 

 silica, giving .32 for the weight of salt. 



i, To the saline solution in h, a few drops of carbonate of 

 ammonia were added, by which .02 more of carbonate of lime were 

 got, equivalent to .11 of lime, and to .22 of chloride of calcium, 

 which, subtracted from the saline residue of .32, gave now .298 

 for the salt. The solution of the salt was not affected by hydro- 

 sulphuret of ammonia. 



k, After the saline solution had been again evaporated, the 

 residue ignited and redissolved, cubical crystals were obtained by 

 spontaneous evaporation. To the solution of these crystals, 

 chloride of platinum was added, when, after a little, a yellow pre- 

 cipitate formed ; and the liquid being crystallized spontaneously, 

 crystals of the double chloride of platinum and sodium were ob- 

 tained, which were taken up by weak alcohol. The residual 

 double chloride of platinum and potassium, duly dried, weighed 

 .3, equivalent to .0580 of potash, and to .0916 of chloride of 

 potassium, leaving for chloride of sodium .2064, equivalent to 

 .1099 of soda. The double chloride of platinum and sodium 

 decomposed by sulphate of ammonia and heat, yielded efflores- 

 cent crystals ol sulphate of soda. 



/, The residue of .47 left by the potash ley in c, was resolved 

 by fusion with carbonated alkalies, and other necessary steps, in- 

 to .27 of silica, .04 of oxide of iron, and .01 of lime. 



We have thus in 24.68 grains of the mineral, exclusive of 

 water, 



