Kri CONTENTS. 
ONNES (H. KAMERLINGH) presents a paper of Dr. W. H. Kzesom: “On the 
deduction of the equation of state from BOLTZMANN’s entropy principle”. 240. 
— presents a paper of Dr. W. H. Kersom: “On the deduction of BoLtzMann’s 
entropy principle of the second virial-coefficient for material particles (in the 
limit rigid spheres of central symmetry) which exert central forces upon each 
other and for rigid spheres of central symmetry containing an electric doublet 
at their centre. 256. 
— presents a paper of Mr. W. J. pe Haas: “‘Isotherms of diatomic gases and of 
their binary mixtures. X. Control measurements with the volumenometer of the 
compressibility of hydrogen at 20° ©”. 295. XL. On determinations with the 
volumenometer of the compressibility of gases under small pressures and at low 
temperatures. 299. 
— presents a paper of Dr. W. H. Kersom: “On the second virial-coefficient for 
diatomic gases”. 417. | 
— presents a paper of Dr. W. H. Krrsom: “On the second virial-coefficient for 
monatomic gases and for hydrogen below the BoyLE-poinv’. 643. 
— presents a paper of Mr. J. F. Srrxs: “Measurements of the ultra-violet mag- 
netic rotation ia gases.” 773. 
— presents a paper of Prof. L. H. Sterrsema: “Determinations of the refractive 
indices of gases under high pressures” 2nd Communication. 925. , 
— presents a paper of Dr. Benet Beckman: “Measurements on resistance of a 
pyrite at low temperatures down to the melting point of hydrogen’’. 1384. 
— Further experiments with liquid helium. H. VIL. 1406. 
— and Mrs. ANNA BECKMAN: On piezo-electric and pyro-electric properties of 
quartz at low temperatures down to that of liquid hydrogen. 1380. 
— and Benet BECKMAN. On the Hatt-effect and the change in the resistance in 
a magnetic field at low temperatures. I. 307. II. 319. ILL. 649. IV. 659. V. 664, 
VI. 981. VU. 988. VIII. 997. 
— On the change induced by pressure in electrical resistance at low temperatures. 
I. 947. 
— and C. A. CROMMELIN : Isotherms of monatomic substances and of their binary 
mixtures. XIII. The empirical reduced equation of state for argon. 273. XIV. 
Calculations of some thermal quantities of argon. 952. 
— and Madame P. Currie. The radiation of Radium at the temperature of liquid 
hydrogen. 1430. 
= ©. Dorsman and Sopuus WEBER. Investigations on the viscosity of gases at low 
temperatures. [. Hydrogen. 1386. 
— and W. J. pr Haas. Isotherms of diatomic substances and of their binary 
mixtures XII. The compressibility of hydrogen vapour at and below the boiling 
point. 405. 
— and E. Oosreruuts. Magnetic researches. VI. On paramagnetism at low tem- 
peratures. 322. VII. 965. VIII. On the susceptibility of gaseous oxygen at low 
temperatures. 1404. 
— E. Marntss and C. A. CROMMELIN. On the rectilinear diameter for argon. 667. 960. 
