( 833 ) 
in hydrogen sulphide, and the second the equilibria between two 
liquid layers and vapour. The former three-phase curve (SL, G@) gives 
5 
20 
15 
{0 
e 
oO 
5 
15 20 25 30 je ae 
Wig 2. 
stable states all over its course; the other (1,4,G) metastable states 
below 29.5°, above this stable equilibria. The isothermal differences 
of pressure between these two three-phase curves and the above- 
mentioned boiling-point curve of hydrogen sulphide, are very slight, 
and are near the errors of observation, as regards their order of 
magnitude. Still I think I am justified in concluding with certainty 
from the great number of observations given in the table that the 
pressures are greater on the three-phase curve SL, than on 
L,L,G, and that the boiling-point line of hydrogen sulphide lies 
higher than either. 
Also looked upon from a theoretical point of view this order 
