1892.] Formation and Decomposition of Nitrous Acid. 37 



amount of nitrous acid being as before at a temperature of 32 ; they 

 also show that with decrease of concentration the percentage ratio of 

 nitrous acid is increased, though its total amount is decreased. 

 Experiments were then conducted with acids of greater concentration, 

 the results of which are given below. 



Concentration of acid = 0'3457 gram in 1 c.c. 



Series- XVI. 

 Temperature, 22. 



Series XVII. 

 Temperature, 32. 



Concentration of acid = 0'6338 gram in 1 c.c. 



Series XIX. 

 Temperature, 22'5. 



