IV CONTENTS. 
BROUWER (u. A). On the granitic area of Rokan (Middle-Sumatra) and on contact 
phenomena in the surrounding schists. 1190, 
BRUIN (G. DE). A crystallized compound of isoprene with sulphur dioxide. 585. 
— and Ernst Couen. The metastability of the metals in consequence of allotropy, 
and its significance for Chemistry, Physics and Technics. IIL. 926. 
BiicH NER (E. u.) and L. K. Worrr. On the behaviour of gels towards liquids and 
the vapours thereof. Il. 92. 
CADMIUM (The allotropy of). IL. 54. IIT. 122. IV. 638. V. 1050. 
CAMELIDAE (The vagus area in). 1119. 
cANAL-RAYS (The universality of the ZrrMaN-eftect with respect to the Srark-effect 
in). 873. 
CAPILLARY PRESSURE (On the measurement of the) in a soap-bubble. 946. 
CAPILLARITY (Measurements on the) of liquid hydrogen. 528. 
CATALYSE (On). 546. 
CHEMICAL constant (The) and the application of the quantumtheory by the method 
of the natural vibrations to the equation of state of an ideal monatomic gas, 20. 
Chemistry. A. Smrrs and A. H. W. Aten: “The application of the theory of allotropy 
to electromotive equilibria”. IL. 37. ILI. 680. 
— E. Conen and W. D. HELDERMAN : “The allotropy of cadmium. IL. 54, [IT 122. 
IV. 638. V. 1050. 
— E. Corner and W. D. Hetperman: “The allotropy of zinc.” IL. 59. IIL. 641. 
— E. Conen and W. D. Hetperman: “The allotropy of copper”. II. 60. 
— F. A. H. SCHREINEMAKERS: “Equilibria in ternary systems”. XV. 70. XV1. 169. 
XVII. 767. XVIII. 1260. 
— L. K. Worrr and E. H. Biiconer: “On the behaviour of gels towards liquids, 
and the vapours thereof’. IL. 92. 
— A. Smrrs and 8. Postma: “The system ammonia-water’’. 182. 
— Ernst Couen: “The metastability of the metals in consequence of allotropy and 
its significance for Chemistry, Physics and Technics”. 200. 
— F. M. JARGER and Ant. SIMEK: “Studies in the field of Silicate-chemistry”. 
11. 239. III. 251. 
— F. M. Jarcer: “The temperature-coefticients of the free surface-energy of liquids 
at temperatures from —80° to 16509 C. I. 329. F. M. JArGER and M. Smit. 
II. 365. III. 386. F. M. JaeGer and J. Kann. IV, 395. F. M. Jarcer. V. 405. 
VI. 416. VII. 555, VIUI.9571:. 
— F. A. H. ScHREINEMAKERS and Miss W. C. pe Baar: “The system: copper 
sulphate, copper chlorid, potassium sulphate, potassium chlorid and water at 
80° C.” 533. 
— J. Borsnken: “On catalyse”. 546. 
— G. pr Bruin: “A crystallized compound of isoprene with sulphur dioxide”, 585. 
— H. KR. Krouyr: “Current potentials of electrolyte solutions”. 615. 
— H. R. Krurr: “Electric charge and limit value of colloids”. 623. 
— Ernst ConeN and J. C vaN DEN BoscH: “The allotropy of antimony”. I, 645, 
