Water of a Spring on the Estate ofFordel, S^c. 101 



which, exclusive of the carbonic acid, is nearly .18 of oxygen to 

 .82 of nitrogen. 



At the above rate, the volumes of the gases contained in an 

 English pint of the water, are, of 



Carbonic Acid, . . .420 of a cubic inch. 

 Oxygen, . . . 179 



Nitrogen, . . . .810 



1M9 cubic inches. 



Which is in the proportion of 



Carbonic Acid, . . .300 

 Oxygen, . . . .127 

 Nitrogen, . . * .573 



1.000 



Preliminary/ trials of the Water hy Tests. 



Even when recent, it did not perceptibly redden tincture of 

 litmus, though the tint was compared with the colour of the 

 tincture diluted to a similar extent. 



It did not affect the colour of Brazil wood or turmeric test- 

 paper. With tincture of galls it gave a slight tinge of purple, 

 and ultimately a scanty purplish brown flocculent precipitate, 

 shewing the presence of iron, and by the purplish tinge also the 

 presence of earthy or alkaline salts. 



The water, next day, gave no tinge with the tincture, shew- 

 ing the iron to be principally in the state of a carbonate. 



When the water was evaporated by a gentle heat, flocculi of 

 oxide of iron were deposited. 



The water, upon being boiled, gave a considerable yellowish- 

 white precipitate, indicating carbonates. This precipitate was 

 soluble, with considerable effervescence, in nitric acid. 



The water decanted off from this precipitate, gave no tinge 

 with tincture of galls, but, on boiling it with a few drops of ni- 

 tric acid, to peroxidise the iron which it might contain, the ex- 

 cess of acid being afterwards neutralized by ammonia, it gave 

 unequivocal traces of iron, by a darkish tinge with the tincture. 

 From this it was inferred that the iron in it was in the state of 

 protoxide. A portion of this water, after being thus treated, 

 also gave a red tinge, with sulpho-cyanate of potash. 



With ferro-cyanate of potash, and a drop of muriatic acid. 



