KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 



TE AMSTERDAM. 



PROCEEDINGS 



VOLUME XXI 

 NO. 10. 



President: Prof. H. A. Lorentz. 

 Secretary: Prof. P. Zeeman. 



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

 Natuurkundige Afdeeling." Vol. XXVII). 



CONTENTS. 



H. HAOA and F. Zernike: "On thermoelectric currents in mercury", p. 1262. 



J. DROSTE: "On integral equations connected with differential equations", p. 1269. 



J. D. VAN DER Waals Jr.: "On the Theory of the Friction of Liquids, II. (Communicated by Prof. 

 J. D. VAN DER WAALS), p. 1283. 



D. COSTER: "On the use of the audion in wireless telegraphy". (Communicated by Prof. H. A. 

 LORENTZ), p. 1294. 



H. P. BARENDRECHT: "Urease and the radiation-theory of enzyme-action", II. (Communicated by 

 Prof. J. BÖESEKEN), p. 1307. 



A. PANNEKOEK: "Investigation of a galactic cloud in Aquila". (Communicated by Prof. W. DE Sit- 

 ter), p. 1323. 



F. E. C. Scheffer and Q. MeijeR: "On an Indirect Analysis of Gas-Hydrates by a Thermodynamic 

 Method and its Application to the Hydrate of Sulphuretted Hydrogen'", II. (Communicated by 

 Prof. J. BÖESEKEN), p. 1338. 



A. SmitS: "On the Phenomenon of Anodic Polarisation". II. (Communicated by Prof. P. Zeemani, 

 p. 1349. 



L. E. J. BROUWER: "Aufzahlung der periodischen Transformationen des Torus", p. 1352. 



82 

 Proceedings Royal Acad. Amsterdam. Vol. XXI. 



