346 



Professors Kirchhoff and Bunsen on Chemical 



M. Sieber, 



the salt possesses the following per-centage com 



position : — 



Chloride of calcium .... 54-28 





Chloride of magnesium ... 2*76 

 Chloride of strontium . . . 11-19 





Chloride of sodium .... 2'01 





Chloride of potassium . . . 7'98 

 Water 21-78 



10000 



Prom the foregoing analyses, it would appear that csesium and 

 rubidium occur pretty generally in the water of brine-springs. 

 These metals, however, are likewise found to be present in the 

 waters of the non-alkaline springs containing but small quan- 

 tities of soluble salts. Thus, we have proved the presence of the 

 salts of these two new alkalies in two of the hot springs at 

 Baden-Baden, namely in the Ungemach and Hollenquelle. 



The former of these springs was found to possess the follow- 

 ing composition in 1000 parts : — 



of the Ungemach hot spring a 



t Baden-Baden. 



Bicarbonate of calcium . . 



1-475 



Bicarbonate of magnesium . 



0-712 



Ferrous bicarbonate . . 



0-010 



Manganous bicarbonate . . 



trace 



Sulphate of calcium . . . 



2-202 



Sulphate of strontium . . 



0023 



Sulphate of barium . . 



slight trace 



Chloride of calcium . . 



0-463 



Chloride of magnesium . 



0-126 



Chloride of sodium . . 



20-834 



Chloride of potassium . . 



1-518 



Bromide of potassium . . 



trace 



Chloride of lithium 



0-451 



Chloride of rubidium . . 



0-0013 



Chloride of csesium . . 



trace 



Silica 



1-230 



Alumina 



. 0-001 



Combined nitric acid . 



0-030 



Combined ammonia . . 



. 0008 



Combined arsenic acid 



trace 



Combined phosphoric acid 



trace 



Combined oxide of copper 



trace 



Indeterminate organic bodies 



trace 



Free carbonic acid . . . 



. 0-456 



29-552 



