KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 



of Saturday October 25, 1913. 



Vol XVI. 



President: Prof. H. A. Lorentz. 

 Secretary: Prof. P. Zeeman. 



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

 Afdeeling van Zaterdag 25 October 1913, Dl. XXID. 



L. J. J. MusKENS: "Rolling movements and the ascending vestibulary connections. (Fasciculus 

 Deitevs Ascendens). (Communicated by Prof. J. K. A. Wertheim Salomonson), p. 338. 

 (With one Table). 



J. P. KuENEN and S. W. Visser: "The virial-coefficient B for normal butane", p. 350. 



J. P. KuENEN and S. "W. Visser : "The viscosity of the vapour of normal butane", p. 355. 



W. H. Arisz: "Positive and negative phototropy of the apex and base in oat-seedlings 

 (Avena sativa/'. (Communicated by Prof. P. A. F. C. Wekt;, p. 363. 



P. VAN RoMBURGH and J. H. Schepers : "2.3.4.6-Tetranitro-phenylmethyl- and ethylnitramine" 

 p. 369. 



A. P. N. FR.4NCII1MONT : "Contribution to the knowledge of the amides", p. 376. 



W. Reinders : "The distribution of a colloidally dissolved substance over two layers". (Com- 

 municated by Prof. F. A. H. Sciireinemakers), p. 379. 



F. A. H. ScHREI^EMAKERS : "Etiuilibria in ternary systems" IX., p. 385. 



W. DE Sitter : "On the constancy of the velocity of light", p. 395. 



M. W. Beijerinck: "Oxidation of manganocarbonate by microbes", p. 397. 



J. D. VAN DER Waals Jr. : "On the law of partition of energy". IV. (Communicated by Prof. 

 J. D. VAN DER Waals), p. 401. 



F. E. C. ScHEFFER: "On the system hexane-water". (Communicated by Prof J. D. van' der 

 Waals), p. 404. 



L. Arisz : "Variations of state in gelatin-solutions". (Communicated by Prof H. Zwaardemaker), 

 p. 418. 



E. OosTERHUis : "Magnetic researches". IX. The deviations from Curie's law in connection 

 with the zero-point energy". (Communicated by Prof H. Kamerlingu Onnes), p. 432. 



II. Kamerlingu Onnes and W. H. Keesom : "The vapour pressures of hvdrogen from the 

 boiling point down to near the triple- point", p. 440. 



Sopiius Weber: "Vapour pressures at very low reduced temperatures. II. The vapour pressure 

 of carbon dioxide in the range from — 140" C. to about — 16C0C". (Communicated 

 by Prof. H. Kamerlingu Onnes), p. 445. 



W. H. Keesom : "On the magnetization of ferromagnetic substances considered in connection 

 with the a.ssumption of a zero-point energy". (Communicated by Prof. H. Kamerlingh 

 Onnes), p. 454. 



W. H. Keesom : "On the magnetization of ferromagnetic substances considered in connection 

 with the assumption of zero-point energy. II. On the susceptibility in the excited ferro- 

 magnetic state". (Communicated by Prof II. Kamerlingh Onnes), p. 468. 



C. A. Crommelin: "Isothermals of monatomic substances <ind their binary mixtures. XV. Tlie 

 vapour pressure of solid and liquid argon, fiom the critical point down to — 206"" 

 (Communicated by Prof H. Kamerlingh Onnesj, p. 477. 



Ernst Cohen and W. D. Helderman : "The AUotropy of Cadmium". I., p. 485. 



Erratum, p. 490. 



22 

 Proceedings Royal Acad. Amsterdam. Vol.XVi. 



