38 



Mr. V. H. Veley. The Conditions of the [June 2, 



Series XX. 

 Temperature, 32. 



The liquids obtained in the experiments detailed above were of a 

 Hue tint, but it was also observed that in the case of the more con- 

 centrated acids red fumes were evolved to a slight extent, thus 

 showing under these conditions a more complex reaction than the 

 simple reversible change given above. It is also to be noticed that 

 the sum of the quantities of nitrous and nitric acids found are less 

 than the quantity of nitric acid originally taken, thus showing that 

 some unaccounted-for destruction of the acid had taken place. In a 

 set of experiments with more concentrated acids the evolution of 

 fumes and the destruction of the acid were further noticeable. 



Concentration of acid = T089 gram in 1 c.c. 



Series XXI. 

 Temperature, 22'3. 



Series XXII. 

 Temperature, 27. 



In the above series of experiments, when the nitric oxide gas was 

 first passed in a yellow colour was produced, but this speedily changed 

 into a deep green tint. It thus appeared that nitrogen peroxide was 

 at first produced and this was converted, possibly by the nitric oxide 

 and possibly, also, by the water present, into the green acid which 

 certain writers have considered to have the composition N 2 3 .N 2 03.H 2 ; 



