1856.] RICHARDSON AND BROWELL MINERAL WATERS. 187 



Table of Analyses. 



Constituents per imperial 

 gallon. I 



No. 6. 



55 



Carbonate of lime traces 



Carbonate of magnesia ...j 12-77 



Peroxide of iron ! "I 



Alumina I J 



Silica 



Organic matter j traces 



Sulphate of soda ' 320-13 



616-77 



Carbonate of soda 

 Chloride of sodium 



Sulphate of lime 



Sulphate of magnesia 



627-63 



Totals , 



1577-85 



No. 7. 



traces 

 5-16 



•24 



No. 8. No. 9. 



10-68 

 •36 



traces sml. qnty, 

 266-91 I 270-25 

 751-50 I 451-95 



575-78 



1599-59 



643-81 

 traces 



1377-05 



5-79 

 17-26 



/ traces 



""•92 



224-84 

 404-60 



500-57 



1153-98 



No. 10. 



19-30 



traces 



-60 



1-40 



traces 



I 216-60 

 J pr. cons, 



1 CI Na 

 sml. qnty, 



237-90 



No. 11, 



67*56 

 traces 

 traces 



"3-60 

 some qty. 



{ 



traces 

 20-76 



91-32 



Appendix. 



The authors have much pleasure in appending the following note, 

 which has been kindly supplied by Dr. Percy, F.R.S., F.G.S. 



Special attention is called by the authors of the paper to analysis 

 No. 11, in which carbonate of lime (dissolved by excess of carbonic 

 acid) co-exists with sulphate of magnesia, both salts being present 

 in considerable quantity. This is explained by supposing that the 

 water first percolates through the dolomite and then through gypsum ; 

 the carbonate of magnesia derived from the former being decom- 

 posed by the gypsum, with the formation of carbonate of lime and 

 sulphate of magnesia. Between twenty and thirty years ago a pa- 

 tent was taken out by a Mr. Grisenthwaite for the manufacture of 

 sulphate of magnesia on a similar principle. Few persons have ever 

 heard of the process, but I saw it in operation in Nottingham, and 

 saw tons of Epsom salts produced by it. Gypsum and calcined dolo- 

 mite were put into large tanks filled with water, and carbonic acid, 

 generated from the combustion of coke, was blown through, when 

 sulphate of magnesia was produced. I thought it might be inter- 

 esting to mention this fact, which may have a geological bearing. 



The carbonate of lead not unfrequently occurring on decomposing 

 galena may arise in a similar way. Sulphate of lead must neces- 

 sarily be first formed ; and, when that salt is brought in contact with 

 water containing carbonate of lime dissolved by carbonic acid, de- 

 composition takes place, carbonate of lead and sulphate of lime being 

 generated. I know this by direct experiments made in my labo- 

 ratory.— [J. P.] 



