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Akt. XVII. PROGRESS OF FOREIGN SCIENCE 



I. Chemical Science. 



i. Analysis of the Mineral and Thermal Waters of Saint 

 Nectaire, Department of the Puy-de-Dome. By M. P. Berthier, 

 Engineer of Mines. 



Anhydrous Salts. Ciyst.iUine Sain, 



Free carbonic acid .... 0.000736 . . . 0.000736 



Bi-carbonate of soda . . . 0.002833 . . . 0.003150 



Muriate of soda 0.002420 . . . 0.002420 



Sulphate of soda 0.000156 . . . 0.000350 



Carbonate of lime 0.000440 . . . 0.000440 



Carbonate of magnesia . . 0.000240 . . . 0.000240 



Silica 0.000100 . . . 0.000100 



Oxide of iron 0.000014 . . . 0.000014 



0.006203 . . . 0.006714 

 Or, supposing the soda in the state of subcarbonate — 



Anhydrous S.ilts. Crystalline Salts. 



Free carbonic acid .... 0.001545 . . . 0.001545 



Subcarbonate of soda . . . "(1002024 . . . 0.005419 



Muriate of soda 0.002420 . . . 0.002420 



Sulphate of soda 0.0001.56 . . . 0.000350 



Carbonate of lime, &c. . . 0.000794 . . . 0.000794 



0.005394 . . . "0008983 

 There are, therefore, few mineral waters so rich in alkaline 

 salts, as those of Saint Nectaire. They are, however, much 

 inferior in this respect to the waters of Vichy, in Auvergne, 

 which contain 0.0038 of anhydrous carbonate of soda, whilst 

 there is only 0.002 in those of Saint Nectaire. — Ann. de Ch. 

 ct de Phus., xix. 122. 



On the Subnitrates, and Super-nitrates. By M.P. Grouvelle. — 

 Berzelius has given the analysis of the subnitrates of lead and 

 copper, in his Essay on the Theory of Chemical Proportions. It 

 thence appears that in the nitrates which he examined, the oxygen 

 of the nitric acid is to the oxygen of the oxide, as 5 to 1 , 2, 3, 6 ; 

 but he does not seem to have studied any other subnitrates. 

 2.347 gr. of a subnitrate of zinc were found to consist of — 

 Oxide .... 1.948 ... 4 atoms . . . 81.69 



Acid .... 0.328 ... 1 . . . 13.75 



Water .... 0.109 ... 2 . . . 4.56 



T3^ 100.00 



