( 561 ) 
fuses with the upper part of the critical line £,L,, K,PN, and we 
have here again the possibility that the line BQN also possesses a 
critical terminating point N. This point bears some resemblance to 
the second critical terminating point found by Smits in gq fig. 2. That 
we are dealing in fig. 9 with a region of two liquid layers could 
only be made plainly visible, if, owing to the non-appearance of the 
solid phase, two liquids, in presence of vapour (metastable), occurred 
below A. Otherwise it is only the peculiar course of BQN, which 
shows that we have this type. 
Mr. Bicuner has succeeded in finding a ease where this course 
could be indicated (although MN remained unattainable). Fig. 10 gives 
a correct representation of the p,¢lines HR and BQ for solid 
diphenylamine in presence of solution in liquid CO, and in vapour 
very rich in CO,, on ER, and in presence of a much more diphenyl- 
amine-containing second liquid phase on BQ. The point PF is situated 
only 0°.6 above the critical point of pure CO,, consequently diphenyl- 
amine is but very sparingly soluble in CO, at that temperature. 
Between 31°6 and 38°8 two liquid phases are not capable of 
existing in presence of solid diphenylamine; above these we again 
find the second three-phase line with two fluid phases now much 
