KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
Pon © GEE RINGS 
VOLUME XXII 
N25: 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling,” Vol. XXVII and XXVIII). 
CONTENTS. 
F. SCHUH: “Theorem on the erm by term differentiability of a series”. (Communicated by Prof. 
D. J. KORTEWEG), p. 376. 
JAN DE VRIES: “Involutions in a field of circles”, p. 379. 
H. ZWAARDEMAKER: “On Polonium Radiation and Recovery of Function”, p. 383. 
W. STORM VAN LEEUWEN and Miss M. Vv. D. MADE: “Researches on scopolamin-morphin narcosis”. 
(Communicated by Prof. R. MAGNUS), p. 386. 
A. DE KLEYN and C. R. J. VERSTEEGH: “On the question whether; or no Darkness-nystagmus 
in dogs originates in the Labyrinth”. (Communicated by Prof. R. MAGNUS), p. 393. 
N. G. W. H. BEEGER: “Bestimmung der Klassenzahl der Ideale aller Unterkörper des Kreiskörpers 
der m-ten Einheitswurzeln, wo die Zahl m durch mehr als eine Primzahl teilbar ist” (2ter Teil). 
(Communicated by Prof. W. KAPTEYN), p. 395. 
H. J. BACKER and J. V. DUBSKY: “On the preparation of z-sulphopropionic acid”. (Communicated 
by Prof. F. M. JAEGER), p. 415. 
J. WOLFF: “Some applications of the quasi-uniform convergence on sequences of real and of holo- 
morphic functions”. (Communicated by Prof. L. E. J. BROUWER), p. 417. 
H. ZWAARDEMAKER and F. HOGEWIND: “On Spray-Electricity and Waterfall-Electricity”, p. 429. 
J. W. LE HEUX: “The Action of Atropin on the Intestine depending on its amount of Cholin”. 
(Communicated by Prof. R. MAGNUS), p. 438. 
. F. VAN BEMMELEN: “The interrelations of the species belonging to the genus Saturnia, judged 
by the colour-pattern of their wings”, p. 447. 
H. W. BERINSOHN: “The influence of Light on the Cell-increase in the Roots of Allium Cepa”. 
(Communicated by Prof. F. A. F. C. WENT), p. 457. 
P. ZEEMAN: “The Propagation of Light in Moving Transparent Solid Substances. I. Apparatus for 
the Observation of the FIZEAU-Effect in Solid Substances”, p. 462. 
. E. J. BROUWER: “Ueber die Struktur der perfekten Punktmengen” (dritte Mitteilung), p. 471. 
B. VON KERéKJARTO: “Ueber Transformationen ebener Bereiche” (Communicated by Prof. L. E. J. 
BROUWER), p. 475. 
— 
is 
Proceedings Royal Acad. Amsterdam. Vol. XXII. 
