134 M. Berzelius on the [Aug. 



taining phosphoric acid, of carrying along with it a portion of 

 that acid, of which it cannot afterwards be completely deprived 

 even by the most powerful bases. 



The quantity of oxide of manganese was ascertained by dis- 

 solving the above 2-514 grammes of carbonate of lime in nitric 

 acid, evaporating the solution completely to dryness, and treat- 

 ing the dry mass with alcohol. A brownish coloured substance 

 remained undissolved ; and the oxide of manganese contained 

 in it was thoroughly freed from any adhering nitrate of lime or 

 nitrate of strontian, by being washed first with alcohol, and 

 afterwards with acidulated water. It weighed after ignition 

 0-004 gramme. The oxide of manganese exists in the water in 

 the state of carbonate : it never forms an ingredient in the 

 sprudelstone, because the carbonate of manganese is almost 

 as soluble in water as the carbonate of magnesia. 



According to these several analyses, the solid ingredients in 

 1000 parts of the Carlsbad water are as follows : 



Sulphate of soda 2-58713 



Carbonate of soda 1-26237 



Chloride of sodium 1-03852 



Carbonate of lime 0-30860 



Fluate of lime 0-00320 



Phosphate of lime 0-00022 



Carbonate of strontian 0-00096 



Carbonate of magnesia 0-17834 



Subphosphate of alumina 0*00032 



Carbonate of iron 0-00362 



Carbonate of manganese 0-00084 



Silica 0-07515* 



5-45927 



The excess of 5-45927 over 5-408, the quantity obtained by 

 the direct evaporation of the water, is occasioned by the mag- 

 nesia, and the metallic oxides being; regarded in this estimate as 

 combined with their full proportion of carbonic acid. 



I have examined in a similar manner the water from the Mill 

 spring, the New spring, and Theresia's spring, but found in 

 them all, not only the same constituents, but these constituents 

 also in exactly the same proportions, as in the water from the 

 Sprudel ; a further confirmation that all the Carlsbad waters 

 proceed from one common main stream, or reservoir. 



As it was not improbable that the Carlsbad water might con- 

 tain a small quantity of potash, I converted a portion of the 

 soluble salts into muriate of soda, and added as much muriate 

 of platinum as was sufficient to form a double salt with the 



* Under the silica I have included a small quantity which was separated from the 

 oxide of iron, and from the phosphate of alumina. 



