KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XX 

 N°. 6. 



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. 



J. J. VAN LAAR: "On the Course of the Values of a and b for Hydrogen at Different Temperatures 

 and Volumes". (Communicated by Prof. H. A. LORENTZ), p. 750. 



H. ZWAARDEMAKER: "A Contribution regarding the Shifting of Radio-active Equilibria under the 

 Influence of Fluorescein", p. 768. 



H. ZWAARDEMAKER: "On Caesium-ions and Cardiac Action", p. 773. 



C. VAN NOORT: "The auditory and visual cortex in the brains of two Madurese. (Communicated by 

 Prof. J. BOEKE), p. 779. 



J. P. Veroouwen Jr: "On the variability of the number of giant pyramidal cells in the Heschl 

 convolution in man". (Communicated by Prof. J. BOEKE), p. 788. 



K. MARTIN: "On some fossils from Celebes, believed to belong to the Oligocene", p. 793. 



K. MARTIN: "On the Miocene Fauna of the West-Progo Mountains in Java", p. 800. 



J. W. LE Heux: "On the Nature of the Constituent of Intestine-Extracts, which exerts a Stimulating 

 Influence upon the Gastro-Intestinal Movements". (Communicated by Prof. C. A. PEKELHARING), 

 p. 805. 



A. H. W. Aten: "On the Passivity of Chromium". (First communication). (Communicated by Prof. 

 A. F. HOLLEMAN), p. 812. 



A. H. W. AteN: "A Third Kind of Sulphur Molecule". (Communicated by Prof. A. F. HOLLEMAN), p. 824. 



N. SCHOORL and Miss A. REGENBOGEN: "Revision of the Tables for the Strength of Spirit". (Com- 

 municated by Prof. P. VAN ROMBURGH), p. 831. 



L. RuTTEN: "On the Rate of Denudation in Java". (Communicated by Prof. C. E. A. WlQHMANN), 

 p. 838. (With one table). 



J. F. VAN BemmeleN: "The wing-markings of Arctiidae", p. 849. 



H. J. Hamburger and E. BrouweR: "On the effept of H2O2 on the peristalsis of the isolated intestine", 

 p. 861. 



G. P. FRETS: "Complicated Mendelian segregation in the heridity of headform in man." (Commu- 

 nicated by Prof. C. WINKLER), p. 865. (With three tables). 



A. W. K. DE Jong: "Action of Solar Light on Cumarin". (Communicated by Prof. P. VAN ROMBURGH), 

 p. 875. 



Arnaud Denjoy: "Sur une propriété des fonctions de variable complexe". (Communicated by Prof. 

 W. KAPTEYN), p. 877. 



P. NIEUWENHUIJSE: "A Contribution to the pathological histology of striated muscle-tissue". (Com- 

 municated by Prof. C. A. PEKELHARING), p. 883. 



H. B. a. BOCKWINKEL: "Some Considerations on Complete Transmutation". (Fifth communication). 

 (Communicated by Prof. L. E. J. BROUWER), p. 893. 



54 

 Proceedings Royal Acad. Amsterdam. Vol. XX. 



