APPENDIX. 



345 



The water holds excess of carbonic acid in solution, 

 and by means of it, a large quantity of carbonate of lime 

 is also dissolved. 



Upon dissipating the carbonic acid, the carbonate of 

 lime falls in abundance. I conclude that at the springs 

 the water contained more carbonic acid than even that 

 you gave me, and that the iron was formerly held in 

 solution by it. Besides these substances, the water 

 contains a large proportion of common salt, and also a 

 considerable proportion of sulphate of lime ; but there 

 are no traces of magnesian salts. 



The water was clear at first, with the exception of 

 the small black flocculi ; being filtered, its specific gra- 

 vity was 1014 . 33 at 60o Farenheit; and ten cubical 

 inches of it were found to yield forty-five grains of dry 

 saline matter, of which, far the largest proportion was 

 common salt. 



I am. Sir, 



Your obedient servant, 

 (Signed) M. FARADAY. 



Lieut. Charles Brand, R.N. 

 &c. &c. &c. 



