KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS 
VOLUME XxXIill 
Nes, 2 and 3. 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling," Vols. XXVIII and XXIX). 
CONTENTS. 
ARNAUD DENJOY : “Sur une propriété de séries trigonométriques”, p. 220. 
L. E. J. BROUWER: “Ueber eineindeutige, stetige Transformationen von Flächen in sich” (Siebente 
Mitteilung), p. 232. 
P. GILBERT RAHM: “Einwirkung sehr niederer Temperaturen auf die Moosfauna”. (Communicated by 
Prof. H. KAMERLI?.GH ONNES), p. 235. 
J. BOESEKEN, W. F. BRANDSMA and H. A. J. SCHOUTISSEN: “The velocity of the diazotisation reaction 
as a contribution to the problem of substitution in the benzene nucleus”, p. 249. 
J. J. VAN LAAR: “On the Critical Quantities of Mercury in Connection with the Increase of the 
Molecular Attraction on Dissociation of the Double Molecules”. I. (Communicated by Prof. 
H. A LORENTZ), p, 267. 
J. J. VAN LAAR: “On the Critical Quantities in the Case of Association, when the Molecular 
Attraction is Considerably Increased on Dissociation of the Molecules to the Isolated Atoms, 
also in Connection with the Critical Quantities of Mercury”. II. (Communicated by Prof. H. A. 
LORENTZ), p. 282. 
NIL RATAN DHAR, A. K. DATTA and D. N. BHATTACHARYA: “Catalysis”. VIII. (Communicated by 
Prof. ERNST COHEN), p. 299. 
NIL RATAN DHAR: “Catalysis. IX. Thermal and photochemical reactions”. (Communicated by 
Prof. ERNST COHEN), p. 308. 
NIL RATAN DHAR: “Catalysis. X. Explanation of some abnormally large and small temperature coef- 
ficients”. (Communicated by Prof. ERNST COHEN’, p. 313. 
S. DE BOER: “On Fibrillation of the Heart”. (First part). (Communicated by Prof. I. K. A. WERTHEIM 
SALOMONSON), p. 319. 
S. DE BOER: “On Fibrillation of the Heart. (Part. II.) On the Relation between Fibrillation of the 
Heart and “Gehäufte” Extra-systoles”. (Communicated by Prof.I.K. A. WERTHEIM SALOMONSON), 
p. 329. 
LUCIE W. SCHUT: “Factors which are of importance for the habit-formation of birds. I Visual sensa- 
tions”. (Communicated by Prof. G. VAN RIJNBERK), p. 338. 
F. M. JAEGER “Two Isomeric Chloro-Tetracetyl-d-Fructoses”, p. 342. 
F. M. JAEGER: “On the Crystalforms of some Substituted Amides of Para-Toluenesulphonic Acid”, p. 347. 
J. F. VAN BEMMELEN: “The colour-markings on the body of Lepidoptera, compared to those of their 
larvae and pupae, and to those of their wings”, p. 363. 
L. HAMBURGER: “On Centres of Luminescence and Variations of the Gas Pressure in Spectrum 
Tubes at Electrical Discharges”. (Communicated by Prof. H. A. LORENTZ). p. 379. 
G. A. F. MOLENGRAAFF and MAX WEBER: “On the Relation between the Pleistocene Glacial Period 
and the Origin of the Sunda Sea (Java and South China-Sea), and its Influence on the 
Distribution of Coralreefs and on the Land- and Freshwater Fauna”, p. 395. (Met twee platen). 
G. A. F. MOLENGRAAFF: “On the Geological position of the Oil-fields of the Dutch East-Indies”, p. 440. 
M. W. WOERDEMAN: “On a human ovary with a large number of abnormal follicles and the genetic 
significance of this deviation”. (Communicated by Prof. J. BOEKE), p. 448, 
15 
Proceedings Royal Acad. Amsterdam. Vol. X XIII. 
