190 COTTON PLANTER'S MANUAL. 



Another part of the liquid, freed from sand, coal, and silicic 

 acid, was boiled with an excess of baryta water, and filtered. 

 The excess of barytes in the filtrate was removed by carbonate 

 of ammonia and ammonia, and filtered the filtrate was evapo- 

 rated to dryness, and dissolved in a small quantity of water. A 

 part of this solution was treated with bi-chloride of platinum ; 

 a yellow crystalline precipitate was formed, showing the pres- 

 ence of potassa. 



A part of the residue was tested with the blow-pipe for 

 soda; the presence of which was proved. 



A portion of the liquid, freed from sand and silica, was 

 treated with chloride of barium ; a white precipitate of sul- 

 phate of barytes was formed, showing the presence of 

 sulphuric acid. 



Quantitative Analysis. 6'lSl grammes of the ash was di- 

 gested with muriatic acid, and evaporated over a water bath 

 to dryness. The residue was gently ignited, and moistened 

 with muriatic acid, then let stand for half an hour, after which 

 it was digested with water, and filtered upon a weighed filter. 

 The coal, sand, &c., remained upon the filter, and was washed 

 out with boiling water, until, on evaporating a drop of the 

 filtrate on the platina foil, no residue remained. 



The filter was now dried, and all the sand, coal, &c., care- 

 fully separated, (in order not to damage the filter), after 

 which, the substance which was on the filter was boiled with 

 potassa in a platina basin over a water bath for one hour ; 

 then filtered upon the same filter, washed out with distilled 

 water, and dried at two hundred and twelve degrees, until it 

 remained at a constant weight. After deducting the weight 

 of the filter, there remained 0*621 grammes of sand and coal. 



The part soluble in potassa, was mixed with muriatic acid, 

 (HC1,) and evaporated over a water bath to dryness; then 

 ignited, and moistened with muriatic acid, (HC1,) and dis- 



