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equilibrium can set in during the determination of the vapour 
pressure. That the preparation that has been prepared at the highest 
temperature, showed the lowest vapour tension, was further an 
indication that the establishment of the internal equilibrium was com- 
pletest at the highest temperature of preparation. On closer examina- 
tion of the observed vapour tensions it appeared later (see the 
following “communication’”’) that this view was really the correct one. 
It was now the question in how far the now found vapour 
pressure line was in harmony with the determinations of the vapour 
pressure, of higher temperature. 
For the vapour pressure at temperatures of 505° up to the triple 
point temperature the following values were found: (see page 966). 
If we now represent this result together with that of Table I, 
preparation 4 in the same Figure, we get the following P7-diagram 
Fig. 2, from which it appears that the different determinations yield 
