Hutchinson — On the Estimation of Oxygen in Wafer. 141 



Percentage Volume Composition. 



Carbonic acid, 18'408 



Oxygen, 31-091 



Mtrogen, • • • 50-500 



Total, 99-999 



Absolute Volume Com,position in Cub. Cents. 



Carbonic acid, 10-238 



Oxygen, 17-294 



E'itrogen, ' 28-087 



Total, 55-619 



Cub. Cents. 

 Yolume of oxygen by Yolumetric method, 19-505 

 ,, ,, ,, Gasometric ,, 17-294 



Excess given by Yolumetric method, 2-211 



Other samples from the same source were also experimented upon, 

 the results being variable. 



"Water of a different character to this last was also experimented 

 upon, -with the following result : — 



Volumetric Method. 



llean of three determinations gave 



25 cub. cents, indigo - 7'25 cub. cents, hyposulphite ; 

 therefore 



7-25 cub. cents, hyposulphite = 1-398 cub. cents, oxygen. 

 Mean of four determinations gave 



3-42 cub. cents, hyposulphite - 75 cub. cents, water. 

 I'rom this we find 



2-420 litres of water contain 12-486 cub. cents, of oxygen. 



