KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday March 25, 1911. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 25 Maart 1911, Dl. XIX). 
Grey EE EE Sie WES: 
J, R. Karz: “Experimental researches on the analogy between swelling (imbibition) and 
mixing”. (Communicated by Prof. C. A. PFKELIHARING), p. 958. (With one plate); 2nd 
Communication, p. 975. (With one plate). 
H. J. Hamsureer, J. pe HAAN and F. Buraxovic: “On the influence of iodoform, chloroform 
and other substances dissoluble in fats, on phagocytosis’, p. 982. 
E. Hexma: “On the stimulating effect of chloride of calcium and cf intestinal mucous mem- 
brane extract on the action of trypsin. (Communicated by Prof. H. J. HAMBURGER), p. 1002. 
IL. KAMERLINGH Onnes and C. A. CROMMELIN: “Isotherms of monatomic substances and of 
their binary mixtures. LX. The behaviour of argon with regard to the law of corresponding 
states”, p. 1012. (With one plate). 
W Hz. Arisz: “On the connection between stimulus and effect in photo-tropic curvatures of 
seedlings of Avena Sativa”. (Communicated by Prof. F. A. F. C. Wenr), p. 1022. 
J. Scumurzer: “On the orientation of crystal-sections’. (Communicated by Prof. C. B. A. 
WICHMANN), p. 1031. 
J. Scumurzer: “On the determination of the optic axial-angle from the extinetion-angle with 
regard to the trace of a discretional plane in a discretional crystal-section”. (Communicated 
by Prof. C. B. A. Wicumann), p. 1035. 
J. Scumurzer: “On the determination of an unknown plane from its traces in two orientated 
erystal-sections”’. (Communicated by Prof. C. E. A. WiciMann), p. 1045. 
J.J. L. D. baron van Homrverr: “Remarks on the reticular cells of the oblongata in different 
vertebrates”. (Communicated by Prof. L. Bork), p. 1047. (With one plate). 
M. W. Beierimcn: “Pigments as products of oxidation by bacterial action”, p. 1066. 
A. A. W. Husrecur: “The Eutherian and the Metatherian early blastocyst”, p. 1077. (With 
one plate). 
J. Worrr: “Quadratic complexes of revolution and congruences of revolution”. (Communicated 
by Prof. JAN pr Vries), p. 1084. 
W. H. Junius and H. B. van per Praars: “Observations concerning anomalous dispersion 
of light in gases”. (First communication), p. 1088. (With one plate). 
H. Kamerrtinan Onnes: “Further experiments with liquid helium”, p. 1698. (With 3 plates). 
H. G. Cannecierer: “lonization of gases by light, emitted from Grisster tubes. Research 
after the existence of selective effects in the ionization”, (Communicated by Prof. W. H. 
Juus), p. 1114. 
Errata, p. 1119, 
Proceedings Royal Acad. Amsterdam. Vol, XIII. 
