KONINKLIJKE AKADEMIE VAN WETENSCHAPrEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday March 31, 1906. 



(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 

 Afdeeling van Zaterdag 31 Maart 190ü, Dl. XIV). 



C03vrTE3vrTS. 



J. K. Veuschaffklt: "Contiibutions to the kDOwledge of van der Waals' i-suiface. X. On 

 the possibility of predicting the properties of nii.\tiircs from those of tlie components". (Com- 

 municated by Prof. H. Kameri.isgii Oxxes), p. "43. (With one plate). 



J. E. Versciiaffelt: '-Appendi-x to the communications published in the meetings of June 28, 

 September 1902 and October 31, 1903", p. 752. 



P. II. ScHOfTE: ''A particular series of quadratic surfaces with eight connnon points and 

 eight common tangential planes", p. 754. 



W. UE SiTTEK: "On the orbital planes of Jupiter's satellites". (Communicated by Prof. 

 J. G. Kaptetn), p. 767. 



Physics. — "Contrihution.t to the knomkch/c of van der Waals' 

 tp-sur/ace. A'. On the ])Ossihility of predicting the properties 

 of mivtures from those of the components." By Dr. J. E. 

 Versch.vffelt. Supplement no. 11 to the Coraniunications from 

 (he Physical Laboratorv at Leiden. (Communicated by Prof. 

 II. Kamerlingh Onxes). 



(Communicated in tlie meeting of .January 27, lOOli). 



1. In the following pages I intend to show that the original 

 equation of van der Waals 



RT rt^. 



^-.:^-^ (^) 



where is put 



«X = rt„ (!-.'■)' + 2 ('„ .r (!-,*■) + «,, x 



and where also are made the simplified suppositions ') 



(2) 



') Comp. Kamerlingh O.nnes and Zakrzewski, Suppl. no. 8, Proc. Sept. 24, 

 1904, p. 227. 



52 

 Proceedings Royal Acad. Amsterdam. Vol. VIII. 



