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



acid which has disappeared in the two cases. This result confirms 

 that of the immediately preceding series in showing the increase of 

 the stability of nitrous acid in the presence of nitric acid. 



Another set of experiments was conducted, the condition of tern-? 

 perature being varied. 



Series XXVIII. 



Volume of solution = 100 c.c. Temperature, ll'l to IT'S. 

 Ratio of nitrous to nitric acid = 1 : 10' 72. 



A third set of experiments was also conducted at a higher tempera- 

 ture, other conditions remaining the same. 



Series XXIX. 



Volume of solution = 100 c.c. Temperature, 31 P 2. 

 Ratio of nitrous to nitric acid = 1 : 10' 13. 



On a comparison of the results set forth in the three preceding 

 series of experiments, it appears that the velocity of decomposition of 

 nitrous acid is an exponential function of the temperature, the former 



