277 



Molecular Surface-Energy 

 " in Erg pro cm^. 



580 



5^0 . 



SOO 



460 



420 



380 



340 



300 



260 



220 



Temperature 



■60' -40' -20- 



0° 20° 40° 60° 



Fig. 2. 



Temperature 



-60° -60° -40° -20° 0° 20° 40° 50' 80° 100° 

 Fig. 3. 



19 



Proceeiiiiiijs Royal Acad. Amsterdam. Vol. XV 111. 



