360 Analysis of the Hoi Spr'nigs at Bath. 



take up the lime precipitated with the oxide of iron by the 

 infusion of galls ; and afterwards with potash, to dissolve 

 any silica which the filter might have furnished — the re- 

 maining substance was evidently oxide of iron, and weighed 

 '2 of a grain. 



(G) The last experiment was repeated, slightly varying 

 the method. Infusion of galls was added, as before, to a 

 quantity of the hot water, measuring after it had cooled 17-J- 

 pints. The precipitate was suffered to subside, and the wa- 

 ter poured off till only a small quantity remained. This 

 was evaporated, and the residuum, treated with nitric acid in 

 a red heat, weighed '5 of a grain. Being exposed to a red 

 heat with carbonaceous matter, it became magnetic, and dis- 

 solved in muriaticacid, excepty^thof agrain, which appear- 

 ed to be silica, derived from the water evaporated to obtain, 

 the precipitate formed by infusion of galls. The muriatic 

 solution afforded a blue precipitate with prussiate of potash, 

 •4 were therefore oxide of iron. 



According to the experiment (F) one quart of the water 

 affords '00421 of a grain of oxide of iron, and by the second 

 •00463, giving a mean of '00442 ; but the iron in the water 

 is in the state of protoxide ; and as the peroxide consists of 

 66'3 protoxide, and 33'3 oxygen, '00442 will give '00394, 

 the quantity of protoxide of iron in one quart. 



242 of muriate of silver indicate 100 of muriate of soda, 

 16' 2 will therefore give Q-6. 



100 of oxalate of lime are produced by 100 of sulphate of 

 lime, 18 will then give 18. 



lOOof sulphate of lime afford 175 of sulphate ofbarytes, 

 18 will then produce 31 '5, which subtracted from 36* 7, the 

 whole quantity of sulphate of baiytes obtained, leave 3' 2 for 

 the sulphate of barytes formed by the sulphate of soda j and 

 as 100 of sulphate of soda give 170 of sulphate of barytes, 

 5-2 yield 3. 



One quart of the water therefore contains 



Carbonic acid - 2-4 inches. 



Sulphate of lime - 18- grains. 



20-4 



Brought 



