( 276 ) 



rapidly with the temperature, it proves liowever, that it is not quite 

 sufficient to Iveep tlie temperature constant to a tentli of a degree. 

 Hence the agreement in tlie different values is not so very great 

 (see table). 



Moreover we sometimes found a slight deviation of the temperature 

 of the critical end-points. We have been able to ascertain that a 

 trace of air has a very great influence on that temperature. With 

 one of the fillings, during which somehow some air had got iiito 

 the tube, we found the whole region of non-miscibility about 5° 

 lower. Possibly this may account for those deviations. 



If in conclusion we draw^ the three-phase pressures and those of 

 the liquid-liquid plaitpoint as functions of the temperature, we find 

 nearly linear function.s for them. The inclinations of the lines amount 



resp. to ( ) = 1,75 K.G. p. cm" per degree and I ) = 3,5 K.G, 



VA 77 1.2.3 \LTJ^i 



fLp\ 

 p. cm^ per degree. Also outside the region of non-miscibility I — — 1 



j-emains almost invariable. 



TABLE of the observed three-phase pressures and end-condensations 



