KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XXV 

 NOS. 5 and 6. 



President: Prof. F. A. F. C. Went. 

 Secretary: Prof. L. BOLK. 



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

 Natuuri<undige Afdeeling," Vol. XXXI). 



CONTENTS. 



H. ZWAARDEMAKER: "On the Alplia-automaticity of the Autonomous Organs", p. 152. 



C. E. B. BremekamP: "Further researches on the antiphototropic curvatures occurring in the 



coleoptiles of Avena". (Communicated by Prof. F. A. F. C. WENT), p. 158. 

 R. WEITZENBÖCK: "Ueber Wirkungsfunktionen". (Communicated by Prof. L. E. J. Brouwer), p. 166. 



|. W. JANZEN and L K. WOLFF: "Studies on the bacteriophagus of D'HERELLE". (Communicated 

 by Prof. C. Eykman), p. 171. 



A. W. K. DE JONG: "The Biscoumaric Acids", p. 175. 



G. HERTZ: "On the Excitation and Ionization Potentials of Neon and Argon". (Communicated by 



Prof. P. Ehrenfest), p. 179. 

 C. A. H. VON Wolzoqen KÜHR: "On the Occurrence of Sulphate-reduction in the deeper layers 



of the Earth". (Communicated by Prof. G. VAN Iterson Jr.), p. 188. 

 E. VAN Thiel: "The Influence of a Catalyst on the Thermodynamic Quantities Regulating the 



Velocity of a Reaction". (Communicated by Prof. J. Böeseken), p. 199. 

 J. BÖESEKEN: "The Dislocation Theory of Catalysis", p. 210. 

 W. E. DE MOL: "The disappearance of the diploid and triploid magnicoronate narcissi from the 



larger cultures and the appearance in their place of tetraploid forms". (Communicated by Prof. 



G. VAN ITERSON Jr.), p. 216. 

 L. J. Smid Jr.: "Numbers of Circles Touching Plane Curves Defined by Representation on Point 



Space". (Communicated by Prof. Hendrik de Vries), p. 221. 

 A. F. HOLLEMAN: "Monochloro-trinitrobenzenes", p. 223. 

 A. A. WEINBERG: "On Respiratory Oscillations in the Qalvanogram of Man". (Communicated by 



Prof. E. D. WiERSMA), p. 225. 



10 



Proceedings Royal Acad. Amsterdam. Vol. XXV. 



