KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 

 TE AMSTEBDAM. 



PROCEEDINGS OF THE MEETINGS 

 of Saturday May 30 and June 27, 1908. 



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

 Afdeeling van Zaterdag 30 Mei en Zaterdag 27 Juni 1908, Dl. XVII). 



CO¥TE¥TS. 



A. P. II. Trivelli : U A contribution to our knowledge of the solarization phenomenon and 

 of some other properties of the latent image". (Communicated by Prof. S. Hoogf/weuff), p. 2. 

 (With one plate). 



H. Kamerlingh Onnes and C. Braak : "Isotherms of diatomic gases and their binary 

 mixtures. VIII. The breaking stress of glass and the use of glass tubes in measurements 

 under high pressure at ordinary and low temperatures", p. 30. (With one plate). 



G. C. J. Vosmaer: "Poterion a Boring-Sponge", p. 37. 



J. J. Blanksma: "Reduction of aromatic nitro-compounds by sodium-disulphide". (Communi- 

 cated by Prof. A. F. IIolleman), p 42. 



A. K. M. Noyons: "About the determination of hardness in muscles". (Communicated by 

 Prof. H. Zwaardemakeu), p. 43. (With one plate). 



J. BoeivE: "On the structure of the ganglion-cells in the central nervous system of Bran- 

 chiostoma lane". (Second Communication). (Communicated by Prof. G. C. J. Vos.maer), p. 53. 

 (With one plate). 



L. E. J. Brouwer: "About difference quotients and differential quotients". (Communicated 

 by Prof. D. J. Korteweg), p 59. 



M. W. Beijerinck: "Fixation of free atmospheric nitrogen by Azotobacter in pure culture. 

 Distribution of this bacterium", p. 67. 



H. C. Prinsen Geerligs: "Rapid change in composition of some tropical fruits during their 

 ripening", p. 74. 



Jan de Vries : "Congruences of twisted curves in connection with a cubic transformation", p 84. 



C. Sanders: "Contributions to the determination of geographical positions on the West coast 

 of Africa" III. (Communicated by Dr. E. F. van de Sande Bakhuyzen), p. 88. 



C. Sanders: "Contributions to the determination of geographical positions on the West coast 

 of Africa" III. Appendix. (Communicated by Dr. E. F. van de Sande Bakhuyzen), p. 107. 



C. Sanders: "Observations of the transit of Mercury on November 14, 1907 at Chiloango in 

 Portuguese West-Africa". ^Communicated by Dr. E. F. van de Sande Bakhuyzen), p. 108. 



P. P. C. Hoek: "Some results of the investigation of the Cirripeds collected during the cruise 

 of the Dutch man-of-war "Siboga" in the Malay Archipelago", p. 110. 



L. S. Ornstein: "Calculation of the pressure of a mixture of two gases by means of Gibbs' 

 statistical mechanics". (Communicated by Prof. II. A. Lorentz), p. 116. 



Til. Valeton: "Lindeniopsis. A new subgenus of the Rubiaceae", p. 123. 



S. H. Koorders: "Contribution N°. 1 to the knowledge of the flora of Java". (Third Con- 

 tinuation), p. 129. 



J. D. van der Waals Jr. : "On the law of molecular attraction for electrical double points". 

 (Communicated by Prof. J. D. van der Waals), p. 132. 



F. A. H. Schreinemakers: "Equilibria in quaternary systems", p. I .'8. 



J. Weeder: "The investigation of the weights in equations according to the principle of the 

 least squares". (Communicated by Prof. II. G. van de Sande Bakhuyzen), p. 142. 



J. D. van der Waals : "Contribution to the theory of binary mixtures". VII, p. 146. 



S. H. Koorders : "Contribution N°. 1 to the knowledge of the flora of Java. (Fourth Con- 

 tinuation), p. 158. 



A. Smits and J. P. Wibaut: "The dynamic conception of a reversible chemical reaction". 

 (Communicated by Prof. A. F. IIolleman\ p. 162. 



A. Smits : "The P.T.X spacial figure for a system of two components which are miscible in 

 the solid or. liquid crystalline state in all proportions". (Communicated by Prof J. D. van der 

 Waals), p. 165. (With one plate). 



H. Kameulingh Onnes : "The liquefaction of heliiuu" p. 168. (Witli 3 plates). 



K. Martin-. "The age of the layers of Sonde' and Trinil on Java", p. 185. 



Proceedings Royal Acad. Amsterdam. Vol. XI. 



