581 



«. Experimental confinnation of the validity of the pseudo 

 ternary views. 



To show that this is actually the case, it was examined how the 

 situation of the points D and A changes with increase of temperature. 

 The shifting of L with the temperature was easy to examine, and 

 we have therefore different observations at our disposal, which, as 

 the figures 7 and 8 show, prove that the equilibrium n:^(i shifts 

 a little to the «-side on increase of temperature. 



IN WEIGHT 7 



100 



HoO 



2" 



93 /o 



o( 



U follows already from this that also the point JJ will have to shift 

 towards the «-side, and to a much greater extent too. 



The determination of the shifting of the point Jj with the tempe- 

 rature does not present any diiïiculties at temperatures below 50° 

 as the velocity of transformation of /i-anhydride into Uarj takes place 

 slowly, so that we can take care, e.g. by continually adding /^-anhy- 

 dride, that there is always /^-anhydride present by the side of the «ay, 



At higher temperatures this velocity of transformation increases, 



