KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS 
VOLUME XXIV 
Nes, 4 and 5. 
President: Prof. F. A. F. C. WENT. 
Secretary: Prof. L. BOLK. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling,” Vol. XXX). 
CONTENTS, 
J. A. SCHOUTEN and D. J. STRUIK: “On Curvature and Invariants of Deformation of a Vm in V‚ ”. 
(Communicated by Prof. JAN DE VRIES), p. 146. 
W.-H. KEESOM: “On the calculation of the molecular quadrupole-moments from the equation of 
state”. (Communicated by Prof. H. KAMERLINGH ONNES), p. 162. 
C. H. HINS: “On a change with the declination in the personal equation in meridian-observations.” 
(Communicated by Prof. W. DE SITTER), p. 168. 
C. E. B. BREMEKAMP: ‘On Anti-phototropic Curvatures ‘occurring in the coleoptiles of Avena.” 
(Communicated by Prof. G. VAN ITERSON JR.), p. 177. 
S. DE BOER: “On the Action of the Novocain on the Tonus of the Skeletal Muscle”. (Communi- 
cated by Prof. I. K. A. WERTHEIM SALOMONSON), p. 185. 
W. VAN DER WOUDE: “On the Path of a Ray of Light in the Field of Gravitation of a Single 
Material Centre”. (Communicated by Prof. J. C. KLUYVER), p. 187. 
P. GILBERT RAHM: “Weitere physiologische Versuche mit niederen Temperaturen’, p. 192. 
“J. W. N. LE HEUX: “Explanation of some Interference-Curves of Uni-axial and Bi-axial Crystals 
by Superposition of Elliptic Pencils’ (Second paper). (Communicated by Prof. HENDRIK DE 
VRIES, p. 195. (With one plate). 
J. BöESEKEN (In collaboration with Messrs. CHR. VAN LOON, DERX, and HERMANS): „The Condition 
of Motion of the Molecules in Space”, p. 198. 
10 
Proceedings Royal Acad. Amsterdam. Vol. XXIV. 
