Adkney— Composition of a Nitrogen Mineral Water. 51 



The gases, which were dissolved in the water, were also deter- 

 mined. They were as follows, expressed in volumes at 0°C., and 

 760 mm. bar., per 1000 volumes of the water :— 



Carbon dioxide, . , . . .140-77 



Oxygen, 0-0 



mtrogen, 27-13 



A portion of the sami)le of water was aerated, and kept out of 

 contact with the air, with a view of ascertaining whether it contained 

 any fermentative organic substances. After aeration the dissolved 



gases had the following composition, expressed as before : 



Carbon dioxide, ...... 122-2 



Oxygen, 5.74 



Mtrogen, 12-44 



The remainder of the aerated portion was kept for three months 

 out of contact with the air, and the composition of the dissolved gases 

 was then found to be practically the same. 



It may be gathered from the very small quantity of organic 

 nitrogen wliich the sample contained, and from the fact tliat the 

 organic substances which it did contain were non-fermentative, that 

 the sample contained no polluting matters which would render it 

 unfit for potable purposes. 



It should be noted that the sample, when collected, was quite 

 clear and colourless, and free from turbidity. 



Further samples of the evolved gases, and of the water, were 

 subsequently (ifilected, just previous to heavy rains succeeding a long 

 period of dry weather, and when the autumn season had well advanced. 

 The sample of water was, as before, quite clear and colourless. It 

 yielded the following results on analysis : — 



Organic nitrogen, 0-008 



Nitrogen as ammonia, . . . . . O'OH 



Nitrogen as nitrates, 0-0 



Nitrogen as nitrites, 0*0 



Chlorine, . . .... 45-87 



Total solids, . . . ' . 122-6 



The gases dissolved in the water, expressed as before in volume 

 per 1000 volumes of the water : — 



Carbon dioxide, ...... 138*88 



Oxygen, O.34 



Nitrogen, 21-18 



