Medicinal Mineral Water at Helwdn. 287 



and clay, which it is continually impregnating with salt un- 

 der the evaporating influence of the sun. Mr Erben, who 

 accompanied me, bathed in the spring, and experienced sen- 

 sations of a slight prickly heat all over his body, which lasted 

 about half a minute, and his hands retained the odour of vio- 

 lets for about ten minutes." 



The analyses were kindly undertaken by my friend Dr 

 Hofmann, Professor at the Royal College of Chemistry, who 

 gave me the following results of his examination of the con- 

 tents of the three bottles, and of a specimen of a rock sent 

 along with them. 



1. The bottle marked " Southern Spring." (B.) 



Amount of fixed constituents in the gallon (70,000 grains), 352 grs. 



Mineral Oxides. Mineral Acids. 



tvt ' . I in large Sulphuric acid, "I in large 



Magnesia, > ^P „ * . . , ' } 9 



o i° quantity. Carbonic acid, J quantity. 



Iron, 1 Hydrochloric acid — trace. 



» i • * traces. 



Alumina, J 



The water contained free sulphuretted hydrogen 



The water was especially examined for iodine, but none 

 was found. However, in order to decide this question in a 

 positive manner, a much larger quantity of water would be 

 required. 



No definite statement can be made as to the mode in which 

 the bases are combined with the acids, without a full quan- 

 titative analysis. From the fact, however, that the water, 

 when boiled, furnished a deposit of carbonate of lime, it may 

 be inferred that it probably contains the following salts : — 



Carbonate of lime, 1, u , , ^ , „ . 



Carbonate of iron, j heW m solufclon b ? free carbomc acld " 



Sulphate of lime. 



Sulphate of magnesia. 



Sulphate of soda. 



Chloride of sodium. 



Sesquichloride of aluminum — traces. 



2. The bottle marked " Central Spring." (A.) 

 Amount of fixed constituents in the gallon (mean of two 

 experiments), 444 grains. 



