KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PReCEE DINGS 
VOLUME XIX 
NS: 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: “Verslag van de gewone vergaderingen der Wis- en 
Natuurkundige Afdeeling,’ Vol. XXIV and XXV). 
CONTENTS, 
H. C. DELSMAN: “On the relation of the first three cleavage planes to the principal axes in the 
embryo of Rana fusca Rosel.” (Communicated by Prof. G. C. J. VOSMAER), p. 498 
M. J. HUIZINGA: “Electrolytic phenomena of the molybdenite-detector’. (Communicated by Prof. 
H. HAGA), p. 512. 
F. A. H. SCHREINEMAKERS: “In-, mono- and divariant equilibria.” X, p. 514. 
W. DE SITTER: “On the relativity of rotation in EINSTEIN’s theory”, p. 527. 
M. J. VAN UVEN: “Logarithmic Frequency Distribution.’ (Communicated by Prof. J. C. KAPTEYN), 
p. 533. 
J. M. BURGERS: “Note on P. SCHERRER’s calculation of the entropyconstant.” (Communicated by 
Prof. H. KAMERLINGH ONNES), p 546. 
G. HOLST and E. OOSTERHUIS: “Note on the melting point of palladium and WIEN’s constant c,.” 
(Communicated by Prof. H. KAMERLINGH ONNES), p. 549. p 
H. ZWAARDEMAKER: “The Electrical Phenomenon in Smell-mixtures”, p. 551. 
H. R. KRUYT: “The equilibrium solid-liquid-gas in binary systems which present mixed crystals.” 
(Fourth communication). (Communicated by Prof. ERNST COHEN), p. 555. 
J. D. JANSEN: “On Nitro-derivatives of Alkyltoluidines and the relation between their molecular 
refractions and those of similar compounds.” (Communicated by Prof. P. VAN ROMBURGH), p. 564. 
P. EHRENFEST: “On adiabatic changes of a system in connection with the quantum theory.” (Com- 
municated by Prof. H. A. LORENTZ), p. 576. 
S WEBER and E. OOSTERHUIS: “On the electric resistance of thin films of metal.” (Communicated - 
by Prof. H. KAMERLINGH ONNES), p. 597. 
32 
Proceedings Royal Acad. Amsterdam. Vol. XIX, 
