KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS OF THE MEETING 
of Saturday February 22, 1913. 
IC 
President: Prof. H. A. Lorenrz. 
Secretary: Prof. P. Zenman. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 22 Februari 1913, Dl. XXI). 
ONE EN Er SE 
C. 'T. vAN VALKENBURG: “On the occurrence of a monkey-slit in man.” (Communicated by 
Prof. C. WINKLER), p. 1040. : 
Wi. J. Warerman: “Metabolism of the nitrogen in Aspergillus niger” (Communicated by 
Prof. M. W. Brtsrrixck), p. 1047. (With one table). “ 
Hi. J. Warrrman: “Metabolism of the fosfor in Aspergillus niger.” (Communicated by Prof. 
M. W. BEIJERINCK), p. 1058. 
C. Braax: “A long range weather forecast for the Eastmonsoon in Java” (Communicated 
by Dr. J. P. van DER STOK), p. 1063. (With one plate). 
8. C. J. Orivier and J. BÖrsEKEN: “Dynamic researches concerning the reaction of FRIEDEL 
and CRAFTS”. (Communicated by Prof. A. F. HorLEMAN); p. 1069. 
L. K. Worrr and E. H. Bücurer: “On the behaviour of gels towards liquids and their 
vapours.” (Communicated by Prof. A. F. HorrrMaN), p. 1078. 
M. W. Brierinck: “Penetration of methyleneblue into living cells after desiceation”, p. 1086. 
C. van WissrrinGm: “On karyokinesis in Eunotia major Rabenh”. (Communicated by Prot. 
J. W. Morr), p. 1088. ; 
J. K. A. Wertiremm SALOMONSON: “On a shortening-reflex”, p. 1092. 
L. S. Ornstery: “On the thermodynamical functions for mixtures of reacting components”. 
(Communicated by Prof. H. A. Lorentz), p. 1100. 
F. E C. Scnerrer: “On velocities of reaction and equilibria.” (Communicated by Prof. A. F. 
HoOrLEMAN), p. 1109. 
F. B. C. Scurrrer: “On the velocity of substitutions in the benzene nucleus.” (Commiunieated 
by Prof. A. F. HOLLEMAN), p. 1118. : 
R. W. Woop and P. ZEEMAN: “A method for obtaining narrow absorption lines of metallic 
vapours for investigations in strong magnetic fields.” p. 1129. 
P. Zeeman: “The red lithiumline.” p. 1130. 
J. D. van per Waars: “Some remarks on the course of the variability of the quantity b of 
the equation of state.” p. 1131. 
N. L. SÖHNGEN: “Oxidation of petroleum, paraffin, paraffinoil and benzine by microbes.” 
(Communicated by Prof. M. W. Briserwenk), p. 1145. 7 
J. P. Kuenen: “The coefficient of diffusion for gases according to O. E. Mryrr. pe ll528 
Jan DE Vries: “On bilinear null-systems.” p. 1156. 
JAN DE Vries: “On plane linear null-systems.”’ p. 1165. 
Miss M.S. pr Vries: “The influence of temperature on phototropism in seedlings of Avena 
sativa.” (Communicated by Prof. W. A. F. C. Wert). p. 1170. 7 
J. D. vaN DER Waars JR.: On the law of the partition of energy.” (Communicated by Prof. 
J. D. VAN DER WAALS), p. 1175. 
P. van RoMBURGH: “Hexatriene 1, 3, 5.” p. i184. 
P. Exnrenrest: “On Ersrer’s theory of the stationary gravitation field.” (Communicated by 
Prof. H. A. Lorentz). p. 1187. 9 
A. PANNEKOEK: “The variability of the Pole-star.” (Communicated by Dr. E. F. van pe 
SANDE BAKHUYZEN), p. 1192. 
F A. H. SCHREINEMAKERS: “Equilibria in ternary systems”, Part IV, p. 12C0, Part V, p. 1213. 
H. R. Kruvr: “The dynamic Allotropy of sulphur.” (Fifth communication). (Conimunicated 
by Prof. P. van RompBuren), p. 1228. 
68 
Proceedings Royal Acad. Amsterdam. Vol. XV, 
