KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday March 30, 1907. 



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

 Afdeeling van Zaterdag 30 Maart 1907, Dl. XV). 



COïrTEÏTTS. 



J. P. van der Stok : "The treatment of wind-observatiuns", p. 684. 



F. M. Jaeger: "On the anisotropous liquid phases of the butyric ester of dihydrocholesterol, 

 and on the question as to the necessary presence of an ethylene double bond for the occurrence 

 of these phenomena". (Communicated by Prof. A. P. N. Franchimont), p. 701. 



P. van Uomburgii and A. D. Maurenbrecher: "On the act'on of bases, ammonia and amines 

 on s. trinitrophenyl-methylnitramine", p. 704. 



W. H. Julius : "Wave-lengths of formerly observed emission and absorption bands in the 

 infra-red spectrum", p. 706. 



0. H. Wind: "A hypothesis relating to the origin of Röntgen-rays", p. 714. 



J. H. Meerburg: "On the motion of a metal wire through a piece of ice". (Communicated 

 by Prof. H. A. Lorentz). p. 718. 



J. D. van der Waals : "Contribution to the theory of binary mixtures", II, p. 727. 



J. D. van der Waals : "The shape of the empiric isotherm for the condensation of a binary 

 mixture", p. 750. 



II. Kamerlingh Onnes and O Braak: "Isotherms of diatomic gaaea and their binary mixtures. 

 VI. Isotherms of hydrogen between —104° C. and —217° C", p. 754. (With 2 plates). 



II. Kamerlingh Onnes and C. Braak : "On the measurement of very low temperatures. 

 XIV. Reduction of the readings of the hydrogen thermometer of constant volume to the absolute 

 scale", p. 775. (With one plate). 



H. Kamerlingh On.kks and W. II. Keesom : "Contributions to the knowledge of the ^-surface 

 of van des Waals. XV r . The case that one component is a gas without cohesion with mole- 

 cules that have extension. Limited miscibility of two gases", p. 786. (With 2 plates . 



47 

 Proceedings Royal Acad. Amsterdam. Vol. IX. 



