and naphthaline, and on a new acid produced. 165 



was soluble in water and alcohol, and was decomposed by 

 heat, with the general appearances already described. 



Copper. Hydrated per-oxide of copper formed an acid 

 salt with the acid, and the solution evaporated in the air 

 left radiated crystalline films. The dry salt when heated 

 fused, burnt with flame, and exhibited the usual appear- 

 ances. 



Nickel. The salt of this metal was made from the moist 

 carbonate. It was soluble, crystalline, of a green colour, and 

 decomposed by heat in the usual manner. In one instance 

 an insoluble sub-salt was formed. 



Silver. Moist carbonate of silver dissolved readily in the 

 acid, and a solution, almost neutral, was quickly obtained. 

 It was of a brown colour, and a powerful metallic taste. By 

 evaporation it gave a splendent, white, crystalline salt ; not 

 changing in the air except when heated ; but then, burning 

 with flame and ultimately leaving pure silver. When the 

 solution of the salt was boiled for some time, a black insolu- 

 ble matter was thrown down, and a solution obtained, which 

 by evaporation gave abundance of a yellow crystalline salt. 

 The changes which took place during the action of heat in 

 the moist way were not minutely examined. 



Mercury. Moist proto-carbonate of mercury dissolved in 

 the acid forming a salt not quite neutral, crystallizing feebly 

 in the air, white, of a metallic taste, not deliquescent, and 

 decomposed with various phenomena by heat. By re-solution 

 in water or alcohol, and heat, a sub-salt of a yellow colour 

 was formed. 



The moist hydrated per-oxide of mercury also dissolved in 

 the acid, forming an acid solution, which by evaporation 



