KONINKLUKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS OF THE MEETING 
of Saturday January 28, 1911. 
An 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 28 Januari 1911, Dl. XIX). 
GERT EERE ES, 
J. Scruurzer: “On the orientation of microscopic crystal sections”. (Communicated by Prof, 
C. B. A. WICHMANN), p. 720. 
W. Kapreyn: “On the integral equation of FREDHOLM”, pe 734. 
H. J. E. Beru: “The oscillations about a position of equilibrium where a simple linear 
relation exists between the frequencies of the vibrations” (3rd part). (Communicated by 
Prof. D. J. Korreweg), p. 742. (With one plate). 
Lucien Gopravx: “On a system of conics in space”. (Communicated by Prof. P. H. Scnovre), 
p. 762. 
L. E. J. Brouwer: “Continuous one-one transformations of surfaces in themselves” (3rd Com- 
munication). (Communicated by Prof. D. J. KorrEweG). p. 767. 
Pu. Kounstamm: “On osmotic temperatures and the kinetic signification of the thermodynamic 
potential”. (Communicated by Prof. J. D. van per Waatrs), p. 778. 
Pu. Konystamm and F. E. C. Scurrrer: “Thermodynamic potential and velocities of 
reaction’. (Communicated by Prof. J. D. van per Waats), p. 789. 
L. S. ORNSTEIN: “Some remarks on the mechanical foundation of thermodynamics”. I. (Com- 
municated by Prof. H. A. Lorentz), p. 804. 
E. H. BücnNer: “Investigations on the radium content of rocks’. II. (Communicated by Prof. 
A. F. HOLLEMAN), p. 818. 
P. van Romevuren: “On the action of nitrous acid on dinitrodialkylanilines”, p. 820. 
A. Suits and H. L. pe Leeuw: “Confirmations of the new theory of the phenomenon of 
allotropy”. I. (Communicated by Prof. J. D. van per Waats), p. 822. (With one plate). 
F. E. C. Scuerrer: “On the determination of threephase pressures in the system hydrogen 
sulphide + water”, (Communicated by Prof. A, F. HorrLRMAN), p. 829. 
Proceedings Royal Acad. Amsterdam. Vol. XIII. 
