Medicinal Mineral Water at Helwdn. 



289 



Dr Hofmann places great reliance. Mr Brazier is now as- 

 sistant to the Professor of Chemistry in Marischal College, 

 Aberdeen. The results of his examination are contained in 

 the following letter : — 



" Aberdeen, July 25, 1853. 



" Dear Sir,— Inclosed are the results of my analysis of 

 the residue of the H el wan mineral water. This I have just ar- 

 ranged according to its per-centage composition, and if this 

 residue corresponds to the same water as that in which Dr 

 Hofmann found 352 grains per gallon, the constituents of a 

 gallon may be easily arrived at by multiplying by 3J. I 

 have not made this calculation, as another water appears to 

 have yielded 444 grains. 



° My analysis indicates much the same as was found by Dr 

 Hofmann's qualitative analysis, only that I find a very con- 

 siderable amount of hydrochloric acid. 



" Hydrosulphuric acid must have been driven off by the eva- 

 poration, if in the free state, or converted into sulphuric acid. 

 Iodine was specially looked for, but no traces of it could be 

 found. 



" 100 parts were found to consist of the following consti- 

 tuents : — 



Chlorine, 









41-420 



Sodium, 









23-920 



Magnesia, 









3-393 



Lime, 









7*350 



Sulphuric acid, 









7-783 



Carbonic acid, 









2-420 



Moisture, 









12-423 



Organic matter, 









1-205 



Silica, 









0-600 



Precipitate by ammonia, 



consis 



,ting ^ 





of alumina and pho 



sphates, 



with > 



0-506 



" These constituents may probably be arranged in the fol- 

 lowing manner : — 



Chloride of sodium, . . 60-820 



Chloride of magnesium, . 6*050 



Sulphate of magnesia, . 2*536 



Sulphate of lime, . . 10-360 



VOL. LV. NO. CX. — OCTOBER 18f° T 



