KONINKLIJKE AKADEmE VAN WETENSCHAPPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday October 27, 1906. 



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

 Afdeeling van Zaterdag 27 October 1906, Dl. XV). 



OOlsTT-EIvTTS. 



L. E. J. Brouwer: "The force-field of the non-Euclidean spaces with positive curvature"» 

 (Communicated by Prof. D. J. Korteweg), p. 250. 



W. VAN Bemmelen : "On magnetic disturbances as recorded at Batavia", p. 266. 



J. J. Blanksma: "Nitration of meta-substituted phenols". (Communicated by Prof. A. F. 

 Holleman), p. 278. 



A. F. Holleman and H. A. Sirks: "The six isomeric dinitrobenzoic acids", p. 280. 



A. F. Holleman and J. Huisinga: "On the nitration of phthalic acid and isophthalic acid", 

 p. 286. 



A. Pannekoek: "The relation between the spectra and the colours of the stars". (Commu- 

 nicated by Prof. H. G. van dk Sande Bakhutzen), p. 292. 



R. A. Weerman: "Action of potassium hypochloiite on cinnamide". (Communicated by Prof. 

 S. A. Hoooewerff), p. 303. 



J. A. C. OuDEMANS : "Mutual occultations and eclipses of the satellites of Jupiter in 1908", 

 p. 304. (With one plate). 



H. Eysbroek: "On the Amboceptors of an anti-streptococcus serum". (Communicated by 

 Prof C. H. H. Sphonck), p. 336. 



W. H. Julius : "Arbitrary distribution of light in dispersion bands, and its bearing on spec- 

 troscopy and astrophysics", p. 343. (With 2 plates). 



F. M. Jaeger: "On a substance which possesses numerous different liquid phases of which three 

 at least are stable in regard to the isotropous liijuid". (Communicated by Prof H. W. Bakhuis 

 Roozeboom), p. 359. 



H. W. Bakhuis Roozeboom: "The behaviour of the halogens towards each other", p. 363. 



W. A. Versluys: "Second communication on the Pliicker equivalents of a cyclic point of a 

 twisted curve". (Communicated by Prof. P. H. Scuoute), p. 364. 



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

 XIII. Determinations with the hydrogen thermometer", p. 367. (With one plate). 



Errata, p. 378. 



17 



Proceedings Royal Acad. Amsterdam. Vol. IX. 



