KONINKLIJKE AKADEMIE VAN WETENSCHAPrEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday June 24, 1905. 



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

 Afdeeling van Zaterdag 24 Juni 1905, Dl. XIV). 



H. ZwAAKDEMAKEK: "Uii tlic inx'ssurc of soiind in Corti's organ", p. 60. 



H. W. Bakhuis Eoozeboüm and J. Olie Jr.: "The solubilities of the isoinerie chromic 

 chlorides", p. 66. 



J. J. Blanksma : "Nitration oi' symmetric nitrometaxylene". (Communicated by Frof. A. F. 

 IIolleman), p. 70. 



H. IvAMEUHNGii OïsNES: I. "Improvement to the n])en mercury manometer of reduced height 

 with transference of pressure by means of compressed gas", p. 75. II. "Improvement in the trans- 

 ference of pressure by compressed gas especially for the determination of isothermals", p. 76. 

 (With one plate). 



H. Kamerlixgii Onnes : "Methods and apparatus used in the cryogenic laboratory. VII. A 

 modified cryostat, p. 77. (With one plate). VIH. Cryostat with licjuid oxygen for temperatures 

 below — 21ü°C. p. 79. (With one plate). IX. The jjurifying of gases by cooling combined 

 with compression, especially the preparing of ])ure hydrogen", p. 82. 



L. Bolk: "On the development of the Cerebellum in Man" (2nd partj, ]>. 8:5. (With one platel. 



A. J. P. VAN 1>E BuoEK : "On tlie sympathetic nervous system in Monotremes". (Communicated 

 by Prof L. Bolk), p. 91. (With one plate). 



H. G. Joxkek: "Some observations on the geological structure and origin of the Ilondsrug". 

 (Communicated by Prof. K. Martin), p. 96. 



J. Weeoer: "Approximate formulae of a high degree of accuracy for the ratio of the triangles 

 in the determination of an elliptic orbit from three observations", tl. (Communicated by Prof. 

 H. G. VAN UE Sande Bakhvyzen), p. 104. 



J. A. C. OuDEMANS : "Supplement to the account of the determination of the longitude of 

 St. Denis (Island of Keunion), executed in 1874, containing also a general account of the 

 observation of the transit of Venus", p. 110. 



F. M. Jaeger : "On some derivatives of Phenylcarbamic acid". (Communicated by Prof. 

 P. VAN Uomburgh), p 127. 



P. VAN KoMBURGii: "On the presence of lupeol in some kinds of gutta-percha", p. 137. 



P. VAN KoJiBURGH : "On the action of ammonia and amines on allyl formate", p. 138. 



A. J. Ultee : "On the action of hydrocyanic acid on ketones". (Comniunicated by Prof. 

 P. VAN Romburgh), p. 141. 



J. J. VAN Laar: "The molecular rise of the lower critical temperature of a binary mixture 

 of normal components". (Communicated by Prof. H. A. LorExVTz), ]>. 144. 



F. M. Jaeger and J. J. Blanksma: "On the six isomeric tribromoxylenes". (Communicated 

 by Prof A. F. Holleman), p. 153. 



C. Easton: "Oscillations of the solar activity and the climate". (2nd Communication). (Com- 

 municated by Prof. C. H. Wind), p. 155. 



F. H. Eydman Jr. : "On colorimctry and a colorimetric method for determining the dissociation 

 constant of acids". (Communicated by Prof. S. Hoogewerit), ]). 166. 



W. A. Versluys : "On the number of common tangents of a curve and a surface". (Com- 

 municated by Prof. D. J. Korteweg), p. 176. 



J. D. VAN DER Waals : "Tiie shape of the sections of the surface of saturation normal to the 

 a-axis, in case of a three phase pressure between two temperatures", p. 184. (With 4 plates). 



J. D. VAN DER Waals: "The jfj-x-ecjuilibria of solid and fluid phases for variable values of the 

 pressure", p. 193. (With one plate). 



A. Smits: "On the hidden e([uilibria in the y^-.c-diagram of a binary system in consequence 

 of the appearance of solid substances". (Communicated by Prof J. D. van der Wa.4ls), p. 196, 

 (With one plate). 



A. Smits : "Contribution to the knowledge of the px- and the pT-[incs for the case that two 

 substances enter into a combination which is dissociated in the liquid and the gasphase". 

 (Communicated by Prof. J. D. van der Waals), p. 200. (With 2 plates). 



The following papers were read : 



5 



Proceedings Royal Acad. Amsterdam. Vol. VIII. 



