KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS 
VOLUME XXII 
Nes, 9 and 10. 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling,” Vol. XXVIII). 
CONTENTS. 
A. SCHOENFLIES: “Zur Axiomatik der Mengenlehre”. (Communicated by Prof. L. E. J. BROUWER), 
p. 784. 
L. E. J. BROUWER: “Ueber eineindeutige, stetige Transformationen von Flächen in sich”. (Sechste 
Mitteilung), p. 811. 
F. M. JAEGER: “On the Symmetry of the Röntgenpatterns Obtained by means of Systems Composed 
of Crystalline Lamellae, and on the Structure of Pseudo-Symmetrical Crystals”,p.815.( With one plate). 
L. EERLAND and W. STORM VAN LEEUWEN: “On Adsorption of Poisons by Constituents of the 
Animal Body. I. The adsorbent power of serum and brainsubstance for Cocain”. (Communicated 
by Prof. R. MAGNUS), p. 831. 
A. D. FOKKER: “The Contributions from the Polarization and Magnetization Electrons to the Electric 
Current”. (Communicated by Prof. H. A. LORENTZ), p. 850. 
N. G. W. H. BEEGER: “Ueber die Zerlegungsgezetze fiir die Primideale eines beliebigen algebraischen 
Zahik6rpers im Körper der /-ten Einheitswurzeln”. (Communicated by Prof. W. KAPTEYN). p. 873. 
A. SMITS: “The Electromotive Behaviour of Aluminium” I. (Communicated by Prof. H. A. LORENTZ), 
p. 876. 
ARNAUD DENJOY: “Sur les ensembles clairsemés”. (Communicated by Prof. L. E. J. BROUWER), 
p. 882. 
FERNAND MEUNIER: “Quelques insectes de l'Aquitainen DE ROTT, Sept-Monts (Prusse rhénane)”. 
(Communicated by Prof. K. MARTIN), p. 891. (With one plate). 
M. W. BEIJERINCK: “Chemosynthesls at denitrification with sulfur as source of energy”, p. 899. 
K. W. RuTGers: “Complexes of Plane Cubics with Four Base Points”. (Communicated by Prof, 
JAN DE VRIES), p. 909. 
W. STORM VAN LEEUWEN and Miss C. VAN DEN BROEKE: “Experimental Influence on the Sensitivity 
of various Animals and of Surviving Organs to Poisons”. (Part 1). (Communicated by Prof. R. 
MAGNUS), p. 913. 
W. STORM VAN LEEUWEN and Miss VAN DER MADE: “Experimental Influence on the Sensitivity of 
various Animals and of Surviving Organs to Poisons”. (Part Il), (Communicated by Prof. R, 
MAGNUS), p. 927. 
JAN DE VRIES: “A Congruence of Orthogonal Hyperbolas”, p. 943. 
R. MAGNUS and A. DE KLEIJN: “On Optic “Stellreflexe” in the Dog and in the Cat”, p. 948, 
C. PH. SLUITER: “Rhythmical Skin-growth and Skin-design in Amphibians and Reptiles”, p. 954, 
J. DE HAAN and K. J. PERINGA: “On the genetic relation between lymphocytes and granulated 
leucocytes”. (Communicated by Prof. H. J. HAMBURGER), p. 962. 
Erratum, p. 974. 
52 
Proceedings Royal Acad. Amsterdam. Vol. X XIL 
