KONINKLIJKE AKADEMIE VAN WETENSCHArrEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday September 24, 1904. 



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

 Afdeeling van Zaterdag 24 September 1904, Dl. XUI). 



C02>rTE2srTS. 



J. D. vxy DKK Waals: "The derivation of the formula which gives the relation between the 

 concentration of coexisting phases for binary mixtures", p. 156. 



G. C. Gekrits: "On P.i curves of mixtures of acetone and ethylether and of carbon tetra- 

 chloride and acetone at 0° C". (Communicated by Prof. J. D. van der Waals), p. 162. (With 

 one plate). 



J. J. VAN Laar: "On the latent heat of mixing for associating solvents". (Communicated by 

 Prof. H. W. Bakhuis KoozeboomJ, p. 174. 



A. Smits : "On the phenomena appearing when in a binary system the plaitpointcurve meets 

 the solubilitycurve". 3rd Communication. (Communicated by Prof. H. W. Bakhuis Roozebooai), 

 p. 177. (With 2 plates). 



A. F. HoLLEMAN: "The preparation of silicon and its chloride'', p. 189. 



Y. M. Jaeger: "On the ])reservation of the crystallographical symmetry in the substitution 

 of position isomeric derivatives of the benzene series". (Communicated by Prof A. P. N. 

 Franchimont), p. 191. 



J. C. Kluyver : "Evaluation of two definite integrals", p. 201. 



C. A. J. A. OuDE.MANS: "On Leptostroma austriacum Oud., a hitherto unknown Leptostro- 

 macea living on the needles of Pinus austriaca, and on Ilymenopsis Typhae (Fuck.) Sacc. a 

 hitherto insufficiently described Tuberculariacca, occurring on the withered leafsheaths of Typlia 

 latifolia", p. 206. (With one plate). 



C. A. J. A. OuDKMANS: "On Sclerotiopsis pityophila (Corda) Oud., a Sphaeropsidae occurring 

 on the needles of Pinus silvestris", p. 211. (With one plate). 



EuG. Dubois: "On an equivalent of the Cromer Forest-Bed in the Netherlands". (Communicated 

 by Prof. K. Martin), p. 214. 



H. Kamerlingh Onnes and C. Zakrzewski : "Contributions to the knowledge of van dek 

 Waals' /--surface. IX. The condition of coexistence of binary mixtures of normal substances 

 according to the law of corresponding states", p. 222. (With 2 plates). 



H. Kamerlingh Onnes and C. Zakrzewski : "The determination of the conditions of coexis- 

 tence of vapour and li{[uid phases of mixtures of gases at low temperatures", p. 233. (With one 

 plate). 



J. Weeder: "A new method of interpolation with compensation applied to tlie reduction of 

 the corrections and the rates of the standardciock of the Observatory at Leyden. IIohwü 17, 

 determined by the observations with the transitcircle in 1903". (Communicated by Prof. II. G. 

 VAN DE Sande Bakhuvzen), p. 241. 



The following papers were read : 



11 



Proceedings Royal Acad. Amsterdam. Vol. VII. 



