KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday December 29, 1906. 



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

 Afdeeling van Zaterdag 29 December 1906, Dl. XV). 



COITTEE"TS. 



Max Webf.r : "Ou the fresh-water fish-fauna of New- Guinea", p. 462. 



N. H. Cohen : "On Lupeol". (Communicated by Prof. 1'. aan Romburgh), p. 466. 



N. II. Cohen: "On oc- and ; 9-amyrin fiom biesk". (Communicated by Prof. P. van Romburgh)" 

 p. 471. 



F. M. Jaeger : "On substances which possess more than one stable liquid state, and on the 

 phenomena observed in anisotropous liquids". (Communicated by Prof. A. P. N. Franciiimoxt), 

 p. 472. 



F. M. Jaeger: "On irreversible phase-transitions in substances which may exhibit more than 

 one liquid condition". (Communicated by Prof. A. P. N. Fraxchimont), p. 483. 



O. PostmA: "Some additional remarks on the quantity II and Maxwell's distribution of 

 velocities". (Communicated by Prof. If. A. LorextzJ, p. 492. 



H. Kamerlixgh Oxxes and W. H. Keesum : "Contributions to the knowledge of the ^-surface 

 of van mr Waals. XII. On the gas phase sinking in the liquid phase for binary mixtures", 

 p. 501. (With one plate). 



W. II. Keesom : "Contribution to the knowledge of the ^surface of van DEB Waal.'». XIII. 

 On the conditions for the sinkicg and again rising of the gas phase in the liquid phase for 

 binary mixtures". (Communicated by Prof. H. Kamerlixgh Onnes), p. 508. 



Erratum, p. 511. 



31 

 Proceedings Royal Acad. Amsterdam. Vol. IX. 



