KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEBINGS 
VOLUME XXII 
N°. 3. 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling,” Vol. XXVII). 
CONTENTS. 
JAN DE VRIES: “Null systems determined by linear systems of plane algebraic curves”, p. 156. 
H. 
Ge 
H. 
4 
Bs 
B. A. BOCKWINKEL: “On a certain point concerning the generating functions of LAPLACE,”. (Com- 
municated by Prof. H. A. LORENTZ), p. 164. 
K. WOLFF: “On the so-called filtrable virus of influenza described by VON ANGERER”. (Commu- 
nicated by Prof. C. EYKMAN), p. 172. 
ZWAARDEMAKER and H. ZEEHUISEN: “On the relation between the electrical phenomenon in 
cloudlike condensed odorous water vapours and smell-intensity”, p. 175. 
. GOUDRIAAN: “The zincates of sodium. Equilibriums in the system NayO-ZnO-H,0”.(Communicated 
by Prof. J. BOESEKEN), p. 179. 
. VAN LOHUIZEN: “The Anomalous ZEEMAN-Effect”. (Communicated by Prof. H. A. LORENTZ), p. 190. 
. F. NIESSEN: “A Theory of a Method for the Derivation of the Distribution of Energy in a Narrow 
Spectrum Region from the Distribution of Energy, Observed in an Interferometer”. (Communicated 
by Prof. W. H. JULIUS) p. 200. 
KRUIZINGA: “Some new sedimentary boulders collected at Groningen”. (Communicated by Prof. 
G. A. F. MOLENGRAAFF), p. 225. 
W. DE SITTER: “Theory of Jupiter’s Satellites. II. The variations”, p. 236. 
R. 
if 
MAGNUS and A. DE KLEYN: “Tonic reflexes of the labyrinth on the eye-muscles”, p. 242. 
A. SCHOUTEN: “On expansions in series of covariant and contravariant quantities of higher 
degree under the linear homogeneous group”. (Communicated by Prof. J. CARDINAAL). p. 251. 
sl 
Proceedings Royal Acad. Amsterdam. Vol. XXII. 
