154 Mr. Faraday on the mutual action of sulphuric acid 



when heated burnt with a bright flame, without any red 

 tinge, and left a result of the usual kind. 



Lime gave a white salt of a bitter taste, slightly soluble in 

 water, soluble in alcohol, the solutions yielding imperfect 

 crystalline forms on evaporation: it burnt with flame; and 

 both in the air and in tubes, when heated, gave results 

 similar to those of the former salts. 



Magnesia formed a white salt with a moderately bitter 

 taste ; crystallizing in favourable circumstances, burning 

 with flame, and giving such results by the action of heat as 

 might be expected. 



Iron. The metal was acted upon by the acid, hydrogen 

 being evolved. The moist protoxide being dissolved in the 

 acid gave a neutral salt capable of crystallization. This by 

 exposure to air slowly acquired oxygen, and a portion of 

 per-salt was found. 



Zinc was readily acted upon by the acid, hydrogen 

 evolved, and a salt formed. The same salt resulted from 

 the action of the acid upon the moist oxide. It was mode- 

 rately soluble in hot water, the solution on cooling affording 

 an abundant crop of acicular crystals. The salt was white 

 and unchangeable in the air ; its taste bitter. It burnt with 

 flame, and gave the usual results by heat. 



Lead. The salt of this metal was white, solid, crystalline, 

 and soluble in water and alcohol. It had a bitter metallic 

 taste, with very little sweetness. The results by heat were 

 such as might be expected. 



Manganese. The protoxide of this metal formed a neutral 

 crystalline salt with the acid. It had a slightly austere taste. 



