276 Klaproth on the Chemical Analysis 



[Another specimen of anhydrite from Hall in the Tyrol, con- 

 tained 



Lime 41.75 



Sulphuric acid , . 55. 



Muriate of soda 1 . 



97.75 

 The source of loss in this analysis is not adverted to. The 

 composition of sulphate of lime, deduced fron the mean of 

 Klaproth's Analyses of the Anhydrite, agrees exactly with the 

 equivalents upon Dr. Wollaston's scale.] 



Analysis of Bitter Spar from Hall in the Tyrol. 



This spar accompanies the anhydrite described in the last 

 paragraph. Its component parts are 



Carbonate of lime ...... 68. 



Carbonate of magnesia . . , . 25.50 



Carbonate of iron 1. 



Water 2. 



(Adhering clay) 2. 



98.50 

 Analysis of the Green Earth of Verona. 



This substance, found at Monte Baldo in the Veronese, is 

 much esteemed as a green pigment. After having been heated 

 red hot it acquires a brown colour, and additional hardness, 

 losing 6 per cent, of its weight. It is not soluble in acids, nor 

 do thfey alter its colour. 



A. 



a. 100 grains were mixed with 200 of caustic potassa dis- 

 solved in water, and the mixture evaporated and ignited. In this 

 case the colour remained unchanged till the mass became red 

 hot, when it gi ew yellowish brown : it was dissolved in muriatic 

 acid ; the solution was evaporated to dryness, and the residue 

 being again digested in very dilute muriatic acid, 53 grains of 

 silica were obtained. 



b. Carbonate of soda was then added to the remaining cold 



