Progreis oj' Foreign Science. 417 



lar to that employed by Berzelius, for the analysis of the ores 

 of nickel (see our last Number), and being heated with the flame 

 of a spirit lamp, was subjected to a stream of hydrogen, evolved, 

 from zinc and dilute sulphuric acid. In this way, the presence 

 of oxide of antimony would be proved by the production of 

 water, as he previously ascertained by a comparative experi- 

 ment on an artificial compound. But ao water was formed 

 from the mineral. 



The result of his analysis is : 



Oxygen. Sulphur 



Silver, 0.8865 . . 58.941 which would r4. 36 . . 8.768- 



Antimony, 0.3436 . . 22.84/ require \4.19 . . 8.423 

 Sulphur, 0.2498 . . 16.61 



Earthy matter, 0.0045 . . 0.30 

 Loss,' 1.3100 . . 1.31 



100.00 



The chemical constitution he represents by 2 Sb A'*+3 Ag S*, 



which would give the proportions, 



Silver, 58.98 



Antimony, 23.46 



Sulphur, 17.56 



100.00 

 Klaproth, in his analysis, had ascribed the loss of weight to 

 oxygen, and gave these proportions of the components, 

 Silver, 60 



Antimony, 19 



Sulphur, 17 



Oxygen, 4 



100 

 By adding the weight allowed for the oxygen, to that of the 

 antimony, Klaproth's analysis agrees very closely with M. 

 Bonsdorff' s. Ann. de Chim. et de Phys. xix. i. 



Analysis of the mineral and thermal waters of Mont Dore. 

 By M. P. Berthier. 



These waters are among the most celebrated of mineral 

 springs. The Romans had collected them in a vast and sump- 

 tuous edifice. They are composed as follows: 



Anhydrous Salts. Crystallited Salt*. 



Neutral carbonate of soda . 0.0006330 . 0.0006930 



Muriate of soda .... 0.0003804 



Sulphate of soda .... 0.0000655 



Carbonate of lime . . . • 0.0001600 



Carbonate of magnesia . . 0.0000600 



Silica 0.0002100 



Oxide of iron 0.0000100 



0.0003804 

 0.0001489 

 0.0001600 

 0.0000600 

 0.0002100 

 0.0000100 



0.0015189 0.0016623 



This water is distinguished by the large quantity of silica 



