Phenomena with the Origin of Mineral Veins. 

 The foregoing results may be rendered thus* : — 



» Grains Gramme 



per gallon. per litre. 



Calcium sulphate 680 '0970 



Sodium chloride ...... 5*15 "0735 



Potassium chloride *95 *0135 



Aluminium chloride trace trace 



Ferrous carbonate *16 *0022 



Silica -70 -0100 



Magnesium chloride trace trace 



Carbonic acid trace trace 



Total by addition of constituents . 1376 -1962 



Total found directly .... 13'59 "1938 



409 



Water from Botallack, No. 1. — This was issuing from whole 

 ground at the 205-fathom level, " Higher Mine/' in granite. 

 It is the deepest part of the mine in that portion of the workings ; 

 and the vein is remarkably free from the presence of sulphides, 

 but yields tin ore of great purity. The following results were 

 obtained by analysis : — 



Specific gravity = 1*0006. Total solid contents 42'19 grains 





per gallon. 









Grains 



Gramme 





1 



aer gallon. 



per litre. 



Chlorine . 





9-78 



•1394 



Sulphuric acid 





15-65 



•2232 



Silica . . . 





•70 



•0100 



Alumina 





trace 



trace 



Lime 





9-10 



•1297 



Magnesia . 





. trace 



trace 



Iron . . . 





1-40 



•0199 



Arsenic 





trace 



trace 



Alkaline chlorides 



16-50 



•2353 



Potassium . 





•94 



•0134 



Sodium . . 





5-78 



•0824 



Carbonic acid . 





not estimated 



a 



* As the state of combination in which the various substances present in 

 mineral waters exist cannot be accurately determined, the system of group- 

 ing, adopted in this and the following Tables of a similar nature, must, to 

 some extent, be regarded as arbitrary. 



