KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING ; 
of Saturday September 28, 1912. 
IG 
President: Prof. H. A. Lorentz. 
Secretary: Prof. P. Zeeman. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 28 September 1912, Dl. XXI). 
EO Ar EAN ES. 
J. SNAPPER: “Comparative researches on young and old erythrocytes”. (Communicated by Prof. 
H. J. HAMBURGER), p. 282. 
W. J. pr Haas: “Isotherms of diatomic gases and of their binary mixtures. X. Control 
measurements with the volumenometer of the compressibility of hydrogen at 20° C. p, 295. 
XL On determinations with the volumenometer of the compressibility of gases under low 
pressures and atlow temperatures”. (Communicated by Prof. H. KAMERLINGH ONNES), p. 299. 
H. KAMERLINGH ONNES and Bener BECKMAN: “On the Hatt-effect and the change in the 
resistance in a magnetic field at low temperatures. I. Measurements on the Harr-effect 
and the change in the resistance of metals and alloys in a magnetic field at the boiling 
point of hydrogen and at lower temperatures”, p. 307. — II. “The Harr-effect and the 
resistance increase for bismuth in a magnetic field at, and below, the boiling point of 
hydrogen”, p. 319. 
I. KAMERLINGH Onnes and E. Oosreruuis: “Magnetic researches. VI. On paramagnetism at 
low temperatures”, p. 322. 
H. pv Bors: “A theory of polar armatures”, p. 330. 
C. A. PEKELHARING: “Influence of some inorganic salts on the action of the lipase of the 
pancreas”, p. 336. 
E. A. Wicumann: “On rhyolite of the Pelapis-islands”, p. 347. 
. E. J. Brouwer: “Continuous one-one transformations of surfaces in themselves”, (5th 
Communication), p. 352. 
. Smits: “Extension of the theory of allotropy. Monotropy and enantiotropy for liquids”. 
(Communicated by Prof. A. F. HOLLEMAN), p. 36!. 
A. Smits: “The application of the theory of allotropy to the system sulphur”, IL. (Communi- 
A 
HO 
> 
cated by Prof. A. F. HorLEMAN), p. 369. 
. Smrrs: “The inverse occurrence of solid phases in the system iron-carbon”. (Communicated 
by Prof. A. F. HOrrLEMAN), p. 371. 
F. E. C. Scuerrer: “On the system ether-water”. (Communicated by Prof. J. D. van DER 
WAALS), p. 380. 
F. E. C. Scnuerrer: “On quadruple points and the continuities of the three-phase lines”. 
(Communicated by Prof. J. D. vaN DER WAALS). p. 389. 
H. KAMERLING Onnes and W.J. pe Haas: “Isotherms of diatomic substances and of their 
binary mixtures. XII. The compressibility of hydrogen vapour at, and below, the boiling 
point”, p. 405. 
W.H. Kersom: “On the second virial coefficient for di-atomic gases”, (Communicated by 
Prof. H. KAMERLINGH ONNES), p. 417. 
Errata, p. 431. 
19 
Proceedings Royal Acad. Amsterdam. Vol. XV, 
