CONTENTS. V 



Chemistry. .T. J. van Laar : "On the course of the spinodal and the plaitpoint lines 

 for binary mixtures of normal substances". 3rd communication. 578. 



— A. P. HoLLEMAN : "On the nitration of ortho- and metadibromobenzene". 678. 



— J. J. Blanksma: ''The Introduction of halogen atoms into the benzene core in 

 the reduction of aromatic nitro-compounds". 680. 



— J. J. VAN Laab : "On the course of melting-point curves for compounds which 

 are partially dissociated in the li(iuid phase, the proportion of the products of 

 dissociating being arbitrary". 699. 



— C. J. Enklaak : "Ou Ocimene and Myrcene, a contribution to the knowledge of 

 the aliphatic terpenes". 714. 



— C. J. Enklaar: "On some aliphatic terpene alcohols". 723. 

 CHLORIDES (The solubilities of the isomeric chromic). 66. 



— (On the) of maleic acid and of fumaric acid and on some of their derivatives. 387. 

 CHLORINE, bromine and iodine (Contribution to the knowledge of the isomorphous 



substitution of the elements fluorine). 614. 

 CLIM.VTE (Oscillations of the solar activity and the). 2nd communication. 155. 

 CLOCKS (HüYGENs' svmpathic) and related phenomena in connection with the principal 



and the compound oscillations presenting themselves when two pendulums are 



suspended to a mechanism with one degree of freedom. 436. 

 COHEN (n. h.) and P. van Eomburgh. The occurrence of p-amyrine acetate in 



some varieties of gutta percha. 544. 

 COLORIMETRY (On) and a colorimetric method for determining the dissociation constant 



of acids. 166. 

 COMET HOLMES (Researches on the orbit of the periodic) and on the perturbations of 



its elliptic motion. 642. 

 COMPLEX (.\n article on the knowledge of the tetrahedral). 358. 

 COMPLEXES of rays (A group of) whose singular surface consists of a scroll and a 



number of planes. 662. 

 COMPONENTS (The molecular rise of the lower critical temperature of a binary mixture 



of normal). 144. 



— (Properties of the critical line (plaitpoint line) on the side of the). 271. 



— (The properties of the sections of the surface of saturation of a binary mixture 

 on the side of the). 280. 



— (The exact numerical values for the properties of the plaitpoint line on the side 

 of the). 289. 



— (On the possibility of predicting the properties of mixtures from those of the). 743. 

 COMPOUNDS (On the course of meltingpoint curves for) which are partially dissociated 



in the liquid phase, the proportion of the products of dissociation being arbitrary. 699. 

 CONDUCTIBILITY of heat in crystals (A simple geometrical deduction of the relations 



existing between known and unknown quantities, mentioned in the method of 



VoiGT for determining the). 793; 

 CORALLICM from Timor (On a new species of). 268. 

 CORONA (Measurement of the heat produced by the integral radiation of the) and of 



the solar disk. 503. 

 cOETi's ORGAN (On the pressure of sound in). 60. 



