KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS OF THE MEETING 
of Wednesday December 30, 1914. 
Vor. XVII. 
IGG 
President: Prof. H. A. Lorenz, 
Secretary: Prof. P. Zeeman. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Woensdag 30 December 1914, Dl. XXIII). 
CON. & BNN WS: 
H. pu Bors: “The universality of the ZeEMAN-eftect with respect to the StArk-effect in canal- 
rays”, p. 873. 
J. J. van Laar: “The calculation of the molecular dimensions from the supposition of the 
electric nature of the quasi-elastic atomic forces,” (Communicated by Prof. H. A. Lorentz), 
p- 877. 
J. K. A. WERTHEIM SALOMONSON: “Exaggeration of Deep Reflexes.” p. 885. 
W. H. Kersom and H. Kameritincu Onnesi “The specifie heat at low temperatures. I. 
Measurements on the specific heat of lead between 14° and 80° K. and of copper between 
159 and 22° K.” (Communicated by Prof. H. KAMERLINGH ONNES). p. 894. 
C. Winxter: “A case of occlusion of the arteria cerebelli posterior inferior.” p. 914. 
Ernst COHEN and G. pe Bruin: “The metastability of the Metals in consequence of Allotropy 
and its significance for Chemistry, Physics and Technics,” III, p. 926. 
JAN DE Vries: “Characteristic numbers for nets of algebraic curves.” p. 935. 
Erratum, p. 944. 
Physics. — “The universality of the Zeeman-effect with respect to the 
Stark-effect wm canal-rays.’ By H. pv Bors. (Communication 
from the Bosscua-Laboratory). 
(Communicated in the meeting of November 28, 1914). 
. Notwithstanding several efforts *) no one had succeeded in demon- 
strating the smallest influence of electrostatic fields on spectral lines 
until Stark *) observed such a specific effect for lines emitted by the 
1) See G. F. Hur, Proc. Roy. Soc. 78 p. 80, 1907. P. Zeeman, These Proc. 
19 p. 957, 1911; 20 p. 731, 1911. F. Pascuen & W. Geruacu, Phys. Ztschr. 15 
p. 489, 1914. 
2) J. Starx and his collaborators, Sitz.ber. Berl. Akad. 47 p. 932, 1913; Ann. 
58 
Proceedings Royal Acad. Amsterdam. Vol. XVII. 
