DY, CONTENTS 
LORENTZ (H. A.) The width of spectral lines. 134. 
— presents a paper of Prof. P. Enrerrrsr: “Some remarks on the capillarity theory 
of the crystalline form”. 178. 
— presents a paper of Dr. J. J. van Laar: “Some remarks on the osmotic pres- 
sure”. 184. 
— presents a paper of Prof. P. Wiss and Miss E. D. Bruins: “The magnetic 
susceptibility and the number of magnetons of nickel in solutions of nickel- 
salts”. 246. 
— presents a paper of Prof. P. Werss and Miss C. A. Frankamp: “Magneto- 
chemical researches on ferrous salts in solution”. 254. 
— presents a paper of Dr. G. J. Erras: “On a general electromagnetic thesis and 
its application to the magnetic state of a twisted iron bar’. 327, 
— presents a paper of Dr. H, K. pr Haas: /Confirmation of the principle of 
relativity”. 591. 
— presents a paper of Prof. A. ErNsrriN and Dr. W. J. pr Haas: “Experimental 
proof of the existence of Amppbre’s molecular currents”. 696, 
— presents a paper of Mr. J. Drosre: “On the field of two spherical fixed centres 
in Einstein's theory of gravitation”. 760. 
— presents a paper of Pror. L, H. Srertsmma: “The magnetic rotation of the 
plane of polarisation in titane tetrachloride”. Il. 925. 
— presents a paper of Dr. O. Postma: “Entropy and probability”. 1048, 
— presents a paper of Dr. G, J. Erras: “On the reversible change of the rema- 
nent magnetisation with the temperature”, 1068. 
— Miss. H. J. van LEEUWEN: “Some remarks on the hydrogen-molecule of Bour- 
Desye”. 1071. 
— presents a paper of Dr. J. J. van Laar : “On the additivity of the values of 4 and 
Va of the equation of state, and on the fundamental values of these quantities 
for different elements, in connection with the periodical system”. 1220. 
— presents a paper of Dr. J. J. van Laar: “On the validity of Maruews’ so- 
called valency-law”’. 1235. 
— presents a paper of Dr. W. J. pr Haas: “Further experiments on the moment 
of momentum existing in a magnet’. 1281. 
— presents a paper of Dr. G. J. Euias; “On the influence of alternating currents 
of decreasing intensity on the magnetisation of iron”. 1299. 
— presents a paper of Dr, F. Zernike: “The clustering-tendency of the mole- 
cules in the critical state and the extinction of light caused thereby”. 1520. 
LUTSENBURG MAAS (H. J. VAN) v. Maas (H. J. van LursENBURG). 
MAAS (H. J. VAN LUTSENBURG) and G. van ÍTERSON JR. A microsacchari- 
meter. 258. 
MAGNET (Further experiments on the moment of momentum in a). 1281. 
MAGNETIC ROTATION (The) of the polarisation plane in titanium tetrachloride. I. 101. 
— (The) of the plane of polarisation in titane tetrachloride. IL. 925. 
MAGNETIC stare (A general electromagnetic thesis and its application to the) of a 
twisted iron bar. 327. 
