KONINKLIJKE AKADEMIE VAN AYETENSCHArPEN 

 TE AMSTERDAM. 



PROCEEDINGS OF THE MEETING 

 of Saturday April 23, 1904. 



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

 Afdeeling van Zaterdag 23 April 1904-, Dl. XII). 



OOIsTTElsTTS. 



EiG. Diiiois: "Facts leading; to trace uut the motion and the origin of tlie underj^round 

 water in our sea-provinces." (Communicated by Prof. H. W. Bakhuis Ivoozkboom), j). 738. 



L. II. SiKiiTSKMA: "Investigation of a source of errors in measurements of magnetic rotations 

 of the plane of pohirisation in absorbing solutions." (Communicated by Prof. IT. Kamkui,i>gii 

 Ox>Ks), ]). 760. 



FiiKD. Scinii : "An equation of reality for real and imaginary ])lanc curves with higher 

 singularities." (Communicated by Prof. D. J. KninKWKc; and V. H. Sciioijtk), p. 764. 



C. A. LoBRY DE BiuYN and C. H. Sliitek : "The BECKiiAXN-rearrangement : transformation 

 of acetophenoxime into acetanilide and its velocity", p. 773. 



C. L. JrNGU'.s : "The mutual transformation of the two stereoisomeric pentacetates ofrf-glucose." 

 (Communicated by Prof. C. A. Lonuy dk, Buuyn), p. 779. 



P. H. SciiouTE: "Regular projections of regular polytopes", ]). 783. 



L. E. J. BitouwKii: "On symmetric transformation of S\ in connection with S^ and Si"' 

 (Communicated by Prof. D. ,1. Kohteavf.g), p. 785. 



Pir. KoiixsTAM^r : "On tlie etjuations of Claish'S and van dkr Waai.s for the mean length 

 of path and tlie number of collisions." (Communicated by Prof. J, D. van deu Waals), i). 787. 



Pii. KoiiN.STAAr.M : "On van der Waals' e([uation of state." (Communicated by Prof. J. D. 

 VAN DER Waals), p. 794. 



.1. Peidler: Note on Sydney Yoing's law of distillation." (Communicated by Prof. J. D. 

 VAN DER Waals), p. 807. 



H. A. LoRENTz : "Electromagnetic phenomena in a system moving with any velocity smaller 

 than that of light", p. 809. 



E. Jahnke: "Observation on tlie jiaper communicated on Febr. 27 1904 by JMr. Broiwer: 

 "On a decomposition of the continuous motion about a point of S4 into two continuous 

 motions about of S^'s." (Communicated by Prof. 1). J. Korteweg), p, 831, 



L. E. J. Brottwer: "Algebraic deduction of the decomposability of the continuous motion 

 about a fixed point of S4 into those of two S^'s." (Communicated by Prof. D. J. Korteweg), 

 p. 832. 



A. A. W. lIx'BRECHT: "On the relationship uf various invcrtcbrate-pliyla", p. 839. 



Max. Weber: "On some of the results of the iSiboga-e.xpedition", p. 846. 



L. BoLK: "The dispersion of the blondine and brunette type in our country", i). 846. 



R. P. VAX Calcar and C. A. Lobry de Briivn: "Changes of concentration in and crystallisation 

 from solutions by itenti-ifiigal power", p. 840. 



C. L. JcNGiis: "Theoretical consideration concerning boundary reactions, which decline in 

 two or more successive {)has('s." fCommunicated by Prof. C. A. Lobry i>k Brijyn p. 846. 



The following papers were read: 



49 



Proceedings Royal Acad. Amslerdam. Vol. VI. 



