KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
PROCEEDINGS OF THE MEETING 
of Friday April 23, 1915. 
Vor. XVII. 
DOG 
President: Prof. H. A. Lorentz. 
Secretary: Prof. P. Zeeman. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Vrijdag 23 April 1915, Dl. XXIII). 
CON TEN ES: 
F. M. Jarcer: “On a New Phenomenon Accompanying the Diffraction of Röntgenrays in 
Birefiingent Crystals.” (Communicated by Prof. H. Haca), p. 1204. (With 4 plates). 
F. M. Jarcer: “Researches on Pasreur’s Principle of the Connection between Molecular 
and Physical Dissymmetry.” I. (Communicated by Prof. P. vay RompBurGH), p. 1217. 
Ernst Conen: “The Allotropy of Bismuth” LI, p. 1236. 
Erxst Conen and W. D. HELDERMAN: “The Metastability of the Metals in consequence of 
Allotropy and its Significance for Chemistry, Physics and Technics” IV, p. 1238. 
P. Eurenrest: “On the Kinetic Interpretation of the Osmotic Pressure.” (Communicated by 
Prof. H. A. Lorentz), p. 1241. 
W. van per Woupr: “On Nöruer’s theorem.” (Communicated by Prof. JAN DE VRIES), 
p- 1245. 
Jan Dr Vries: “A bilinear congruence of rational twisted quinties”, p. 1250, 
JAN DE Vries: “Some particular bilinear congruences of twisted cubics”, p. 1256. 
F. A. H. Scurememaxkers: “Equilibria in Ternary Systems”. X VILL, p. 1260. 
A. W. K. pr Jose: “Action of Sunlight on the Cinnamic Acids’. (Communicated by Prof. 
P. van RompureGn). p. 1274. 
C. E. B. Bremexamur: “On the mutual influence of phototropie and geotropic reactions in 
plants”. (Communicated by Prof. F. A. F. C. Went), p. 1278. 
W. ve Sirrer: “On the mean radius of the earth, the intensity of gravity, and the moon’s 
patallax”’, p. 1291. 
W. pvr Sitter: “On Isostasy, the moments of inertia, and the compression of the earth,” 
p- 1295. 
W. pe Sivrer: “The motions of the lunar perigee and node, and the figure of the moon”, 
p. 1309. 
A. B. Droocirever Fortuyn: “The decoloration of fuchsin-solutions by amorphous carbon.” 
(Communicated by Prof. J. Borke), p. 1322. 
H. J. Hameurcer: “Phagocytes and respiratory centre. Their behaviour when acted upon 
by oxygen, carbonic acid, and fat-dissolving substances. Explanation of the excitement 
Stage in narcosis”, p. 1325. 
80 
Proceedings Royal Acad. Amsterdam. Vol. XVII. 
