CON TEN TS XIX 
PHOTO-OXIDATION (The) of alcohol with the co-operation of ketones. 1640, 
Physics. L. H. Srertsema: “The magnetic rotation of the polarisation plane in 
titanium tetrachloride.” I 101. 
— H, A. Lorentz: “The width of spectral lines.” 134, 
— P. Karenrest: “Some remarks on the capillarity theory of the crystalline 
form.” 173. 
— J. J. van Laar: “Some remarks on the osmotic pressure.” 184, 
— P. Werss and Miss E. D. Bruins: “The magnetic susceptibility and the 
number of magnetons of nickel in solutions of nickelsalts.” 246. 
— P. Werss and Miss U. A. WRANKAMP: “Magneto-chemical researches on ferrous 
salts in solution.” 254. 
— G. J. Erras: “On a general electromagnetic thesis and its application to the 
magnetic state of a twisted iron bar.” 327. 
— P. Zeeman: “FRresNEL’s coeflicient for light of different colours”.’2ud_ part. 398. 
— H. KAMERLINGH ONNEs, C. DorsMAN and G. Horst: “Isothermals of diatomic 
substances and their binary mixtures. XV”, 409. 
— P. Zeeman: “The passage of light through the slit of a spectroscope”. 412, 
— H. KAMERLINGH Onnes, C. Dorsman and G. Hons: ““Isothermals of diatomic 
substances and their binary mixtures”. XVII. 458, 
— H. KAMERLINGH ONNEs, C. A. CROMMELIN and Miss FE. [. Smrp: “Tsothermals 
of diatomic substances and their binary mixtures”. XVITL. 465. 
— C. A. CrOMMELIN and Miss B. [. Smip: “Comparison of a pressure-balance 
of ScHArrer and BupenserG with the open standardgauge of the Leyden 
Physical Laboratory between 20 and 100 atmospheres, as a contribution to the 
theory of the pressure-balance”. 472. 
— H. KAMERLINGH ONNEs and W. H. Kresom: “The specific heat at low tempe- 
ratures”. I]. 484. 
— H. KAMRRLINGH Onnes and Sopuus Weger: “Further experiments with liquid 
helium”, O. 493. 
— H. KAMERLINGH Onnes: “Methods and apparatus used in the Cryogenic Labo- 
ratory”. XVI. 507. 
— H. KaMERLINGE Onnes and QC. A. CROMMELIN: “Isothermals of monatomic 
‘ 
gases and of their binary mixtures”, XVII. 515. 
— H. K. pe Haas: “A confirmation of the principle of relativity”. 591. 
— -W. H. Kensom: “The second virial-coefficient for rigid spherical molecules 
whose mutual attraction is equivalent to that of a quadruplet placed at their 
centre”. 636. 
— I. K. A. Werrnemm SALOMONSON: “A difference between the action of light” 
and of X-rays on the photographic plate”. 671. 
A. Exysrern and W. J. pe Haas: “Experimental proof of the existence of AMPbrr’s 
molecular currents”, 696. 
— P. ZEEMAN: “On a possible influence of the FrrsNer-coefficient on solar pheno- 
mena’. 711. 
110* 
