KONINKLIJKE AKADEMIË VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Friday May 24, 1907. 



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

 Afdeeling van Vrijdag 2i Mei 1907, Dl. XVI). 



COHTEÏTTS. 



L. Kutten: "On fossil Triehechids from Zealand and Belgium", (Communicated by Prof, 

 C. E. A. Wichmann), p. 2. (Willi one plate). 

 J. W. vax Wijhk: -Oil the 'existence of cartilaginous vertebrae in the development of the 



skull of birds", p. 14. 



M. W. BeiJERINCK: "On luetic acid fermentation in milk", p. 17. 



J. J. vax La IK: -'On the course of the plaitpoint line and of the spinodal lines., also for the 

 ease, that the mutual attraction of the molecules of one of the components of a binary mixture 

 of normal substances is slight". (Communicated by Prof. H. A. LoRENTz), p. 34. 



W. he Sitter: "On periodic orbits of the type Hestia". (Communicated by Prof. J. C. Kaiteyx), 

 p. 47. 



J. D. van der Waals : "Contribution to the theory of biuary mixtures", IV, p. 06. 



Proceedings Royal Acad. Amsterdam. Vol. X. 



