XII C o N T E N T S. 



.lüNGlus (c, },.). Tlieoreticül consideration concerninti' boundnry reactions wliicli 

 decline in two or more successive phases. S4(). 



— and C. A. Lohry ue IjKUYN. Tlie conditiou of hydrates of nickelsulphate in 

 metliyialcoholic solution. 91. 



— The conductive ])o\ver of hydrates of nickelsulphate dissolved in methyl- 

 alcohol. 94, 



KAMERLING 11 onnes(h.) presents a paper of Dr. J. E. A^erschaffelt : "Con- 

 tributions to the knowledge of van der WAALS-Jz-surface. VII. The equations 

 of state and the J/- surface in the immediate neig'hbourhood of the critical state 

 for binary mixtures with a small proportion of one of the components (part 3). 

 .59. (part 4). 115. VIII. The ^«-surface in the neighbourhood of a binary mixture 

 which behaves as a pure substance." 649. 



— presents a paper of W. H. Keesom : "Jsothermals of mixtures of oxygen and 

 carbon dioxide. I. The calibration of manometer and piezometer tubes. 532. 

 II. The preparation of the mixtures and the compressibility at small densities. 

 541. III. The determination of isotherraals between 60 and 140 atmospheres, and 

 between — 15° C. and +60° C. 554. IV. Isothermals of pure carbon d^!oxide 

 between 25° C. and G0° C. and between 60 and 140 atmospheres. 565. V, Iso- 

 therraals of mixtures of the molecular compositions 0.1047 and 0.1994 of oxygen 

 and the comparison of them with those of pure carbon dioxide. 577. VI. Influence 

 of o-ravitation on the phenomena in the neighbourhood of the phiitpoint for 

 binary mixtures." 593. 



Methods and apparatus used in the cryogenic laboratory. VI. The methylchloride 



circulation. 66S. 



presents a paper of Dr. L. H. Siertsema : "Investigation of a source of errors 



in measurements of magnetic rotations of the plane of polarisation in absorbing 

 solutions." 760. 



and C. A. Crommelin. On the measurement of very low temperatures. VI. 



Improveraenls of the protected thermoelements ; a battery of standard-thermo- 

 elements and its use for thermoelectric determinations of temperature. 642. 



— . and H. Happel. The representation of the continuity of the liquid and gaseous 

 conditions on the one hand and the various solid aggregations on the other by 

 the entropyvolume-energy surface of Gibbs. 678. 

 ü A P Ï E Y N (w.). On the differential equation of Monge. 620. 



keesom (w. II.). Isothermals of mixtures of oxygen and carbon dioxide. I. The 

 calibration of manometer and piezometer tubes. 532. II. The preparation of the 

 mixtures and the compressibility at small densities. 541. III. The determination 

 of isothermals between 60 and 140 atmospheres, and between — 15° C. and 

 4-60° C. 554. IV. Isothermals of pure carbon dioxide between 25° C. and 00° C. 

 and between GO and 140 atmospheres. 565. V. Isothermals of mixtures of the 

 molecular compositions 0.1047 and 0.1994 of oxygen, and the comparison of them 

 with those of pure carbon dioxide. 677. VI. Influence of gravitation on the 

 phenomena in the neighbourhood of the plaitpoint for binary mixtures. 593. 



