XVI CONTENTS. 



TERNARY SYSTEM (On the conditions for the occnrrence of a raiuiraum critical tem- 

 perature for a). 225. 



TERNARY SYSTEMS. (IV). 1. (V). 121, 



T E s c II (p.). On the retractive index of rock-glasses. 602. ] 



TETRA15R0M0PHEN0L (The Velocity of transformation of tiljrooniphenol bromine into). 556. I 



THEORY of electrons (Contributions to the). (I). ODS. 



— of electrons (The fundamental ecjuations for electromagnetic phenomena in pon- 

 derable bodies, deduced from the). 254. 



TINAMALGAMS. 373. 



— (The meltingpoint-line oO. 511. 



TOLUENE and Xylene (On the action of sulphur on). 2S8. 



TRIBROOMPHENOL brouiine (The velocity of transformation of) into tetrabromophenol. 556. 



VACÜÜMPUMP (A Kurckhardt-Weiss) for use in the circulations for low temperatures. 



633. 

 VALUES of h (The course of the) for hydrogen, in connection with a recent formula of 



Prof. VAN der Waals. 573. 

 VARIATION (The influence of) of the constant current on the pitch of the singing arc. 



311. 

 VELOCITY of transformation (The) of carbon monoxide 117. 



— of transformation (The) of tribroomphenol l)romine into tetrabromophenol. 556. 

 VERSCHAF FELT (e.). Ou the prussic acid in the opening ])uds of I'runus. 31. 



V E Rsc II A FEE LT (J. E ). Contributions to the knowledge of van der waals' 

 ^/-surface. "VMI. The equation of state and the i^-surface in the immediate neigh- 

 bourhood of the critical state for binary mixtures with a snudl proportion of one 

 the components. 321. 336. 



VOLUMENOMETER (An accurate) and mixing apparatus. 636. 



vosMAER (G. c. J.). Ou the shape of some siliceous spicules of sponges. 1U4. 



VRIES (HUGO Ü e) presents a paper of Prof. E. Verscuaifelt: "On the prussic 

 acid in the opening buds of Prunus." 31. 



VRIES (jan de). On the spiieres of Monge belonging to ordinary and tangential 

 pencils or quadratic surfaces. 4S4. 



waals (van der) 4,-surface (Contributions to the knowledge of). VII. The 



equation of state and the ,1,-surface in the immediate neighi)ourhood of the critical 



state for binary mixtures with a small proportion of one of the components. 



321. 336. 



(Plaitpoints and corresponding plaits in the neighbourhood of the sides of the 



4»-surface of). 445. 

 WAALS (j. d. van der). Ternary systems. (IV). 1. (V). 121. 



— presents a paper of Dr. J. D. van der Waals Jr.: "Statistical electro-mecha- 

 nics". (I). 22. (11). 114. 



On the conditions for the occurrence of a minimum critical temperature for a 



ternary system. 225. 



— Some observations on the course of the molecular transformation. 303. 



— Critical phenomena in partially miscible liquids. 307. 



