1910-11.] Dynamic Method for measuring Vapour Pressures. 181 
was used in the bath and as confining fluid. Since the vapour of the 
salt gave, by interaction with the confining fluid, a continuous stream 
of nitrous oxide, the method had to be modified, and the pressure at 
which the gas-evolution reached a minimum was taken. The error on 
this account, which was not over 5 mm., was the greatest involved. 
The results of Horstmann (H.), Ramsay and Young (R. and Y.), including 
their final curve as well as the separate series by their static and 
dynamic methods, Johnson (J.), and ourselves (S. and M.) are given in 
the following table: — 
