KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XX 

 N°. 5. 



President: Prof. H. A. LORENTZ. 

 Secretary: Prof. P. Zeeman. 



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

 Natuurkundige Afdeeling," Vol. XXV and XXVI). 



CONTENTS. 



W. Storm van Leeuwen and C. de Lind van Wijngaarden: "On the Effect of Lobelin on the 

 Rise of Blood pressure by Nicotin". (Communicated by- Prof. H. ZWAARDEMAKER), p. 630. 



H. R. KRUYT and Miss J. E. M. VAN DER MADE: "Contributions to the theory of dyeing". (First 

 communication). (Communicated by Prof. ERNST COHEN), p. 636. 



H. C. BURGER: "On the Theory of the Brownian Movement and the Experiments of Brillouin.". 

 (Communicated by Prof. W. H JULIUS), p. 642. 



F, A. H. SCHREINEMAKERS: "In-, mono- and divariant equilibria". XVIIl, p. 659. 



H. J. HAMBURGER and R. BRINKMAN: "Experimental researches on the permeability of the kidneys 

 to glucose. III. The NaHCO;} percentage in the transmission-fluid", p. 668. 



P. EhrenfesT: "A paradox in the theory of the Brownian movement". (Communicated by Prof. 

 H. A. LORENTZi, p. 680. 



Miss H. J. FOLMER: "A new Electrometer, specially arranged for radio-active Investigations." Part II. 

 (Communicated by Prof. H. HAGAi, p. 684. 



S. DE BOER: "On the ventricle-electrogram of the Frogs' heart". (Communicated by Prof. G. VAN 

 RlJNBERK), p. 696. 



Miss H. J. FOLMER and A. H. BlaauW: "Researches into the Radio-Activity of the Lake of 

 Rockanje". (Communicated by Prof. H. HAOA), p. 714. 



B. P. HAALMEYER: "On Elementary Surfaces of the third order". (Third communication). (Com- 

 municated by Prof. L. E. J. BROUWER), p. 736. 



4« 

 Proceedings Royal Acad. Amsterdam. Vol. XX. 



