KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS 
VOLUME XVIII 
Nos i. 
President: Prof. H. A. LORENTZ. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: Verslag van de gewone vergadering der Wis- en 
Natuurkundige Afdeeling, Dl. XXIV). 
CONTENTS. 
O. POSTMA: “Entropy and Propability.” (Communicated by Prof. H. A. LORENTZ), p. 1048. 
Miss TINE TAMMES: “On the mutual effect of genotypic factors.” (Communicated by Prof. J. W. 
MOLL), p. 1056. 
G. J. ELIAS: “On the reversible change of the remanent magnetisation with the temperature.” 
(Communicated by Prof. H. A. LORENTZ, p. 1068. 
Miss H. J. VAN LEEUWEN: “Some remarks on the hydrogen-molecule of BOHR—DEBEIJE.” (Commu- 
nicated by Prof. H. A. LORENTZ), p. 1071. 
NILRATAN DHAR: “On Catalysis.” (Communicated by Prof. ERNST COHEN). Part I, p. 1084, II, p. 1097. 
S. DE BOER: “On the structure and covering of the trunkdermatomes of the cat.” (Communicated 
by Prof. G. VAN RIJNBERK), p. 1133. 
CHS. H. VAN OS: “On twisted quartics passing through eight associated points.” (Communicated by 
Prof. JAN DE VRIES), p. 1147. 
E. D. WIERSMA: “On the value of the simultaneous registration of the plethysmogram and the psy- 
chogalvanic reaction”, p. 1154. 
G. C. J. VOSMAER: “On the Occurrence of desmas or desmoids in Hymeniacidon sanguinea” p. 1159. 
J. CARDINAAL: “A posthumous work of Dr. P. H. SCHOUTE”, p. 1173. 
F. A. H. SCHREINEMAKERS: “In-, mono- and divariant equilibria” VI, p. 1175. 
H. A. VERMEULEN: “Concerning the nervus sympathicus of domestic animals’, (Communicated by 
Prof. L. BOLK), p. 1191. 
M. W. BEIJERINCK and T. FOLPMERS: “Formation of pyruvic acid from malic acid by microbes”, 
p. 1198. 
H. HAGA and F. M. JAEGER: “The Symmetry of the Röntgen-patterns of Monoclinic Crystals, p. 1201. 
(With six plates). 
Miss E. C. FYAN: “Some young-pliocene Ostracods of Timor”. (Communicated by Prof. J. W. MOLL), 
p. 1205. (With one plate). 4 
Proceedings Royal Acad. Amsterdam. Vol. XVIII. 
