KONINKLIJKE AKADEMIE VAN WETENSCIlArPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday September 29, 1906. 



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

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



oo2vra:E3vrT's. 



M. NiEuwENiiuis-vox Uexküll Güldenbaxü: "Oil the harmful consequences of the secretion 

 of sugar with some myrmecophilous plants". (Communicated by Frof. J. W. Moll), p. 150. 



II. Kameklingh Oxkes: "Methods and apparatus used in the cryogenic Laboratory at Leiden. 

 X. How to obtain baths of constant and uniform temperature by means of liquid hydrogen", 

 p. 156. ("With 3 plates); XI. "The purification of hydrogen for the cycle", p. 171. ("With 1 plate); 

 XII. "Cryoetat especially for temperatures from —252° to —259°", p. 17?. (With 1 plate); XIII. 

 "The preparation of liquid air by means of the cascade process", p. 177. (With 1 plate); XIV. 

 "Preparation of pure hydrogen through distillation of less pure hydrogen", p. 179. 



H. Kamerlixgh Onnes and C. A. Crommelin. "On the measurement of very low temperatures 

 IX. Comparison of a tliermo element constantin-steel with the hydrogen thermometer", p. 180. 



H. Kamerlingii Onnes and J. Clay : "On the measurement of very low temperatures X. 

 Coefficient of expansion of Jena glass and of platinum between -|-1G° and — 182°, p. 199. XI. 

 A comparison of the platinum resistance thermometer with the hydrogen thermometer, p. 207. 

 XII. Comparison of the platinum resistance thermometer with the gold resistance thermometer", 

 p. 213. 



Jan de Vries : "Quadratic complexes of revolution", p 217. 



J. K. A. Wertheim Salomoxson: "A few remarks concerning the method of the true and 

 false cases". (Communicated by Prof. C. Winkler), p. 222. 



J. J. VAN Laar: "The shape of the spinodal and plaitpoint curves for binary mixtures of 

 normal substances. 4th Communication: The longitudinal plait". (Communicated by Prof. 

 H. A. LoRENTz), p. 226. (With 1 plate). 



11 



Proceedings Royal Acad. Amsterdam. Vol. IX. 



