XII CONTENTS. 



THEKMOMAGNETic PHENOMENA (The galvauoiiiasnetic and) in biamutli. 72. 40+. 473. 

 TOB.vcco-LEAVES (On a Gontagium vivum fluidum causing the Spot-disease of the). 170. 

 TRIACYLINS (On synthetically prepared neutral glyceryl- ethereal salts) of saturated 

 monobasic acids with an even number of C-atoms. 338. 



TRINODAL QUARTICS (On). 263. 



VAPOUR- and liquid-phases {The composition and the volume of the coexistiug) of 



mixtures of methylchloride and carbonic acid. 83. 

 VELOCITY (On the) of electrical reaction. 334. 417. 

 vERSCHAFFELT (J.). On the deviation of de Heen's experiments from van der 



Waals' law of continuity. 82. 



— Measurements on the system of isothermallines near the plaitpoint and especially 

 on the progress of the retrograde condensation of a mixture of carbonic acid 

 and hydrogen. 243. 288. 323. 



— Measurements on the change of pressure by substitution of one component by 

 the other in mixtures of carbonic acid and hydrogen. 328. 



VIBRATIONS (On the) of electrified systems, placed in a magnetic field. A contribution 



to the theory of the ZEEMAN-eft'ect. 263. 340, 

 VOLUME (Variation of) and of pressure in mixing. (I) 179. (It) 232. (Ill) 330. 

 VRIES (jan de). On ïrinodal Quartics. 263. 



— On the orthoptical circles belonging to linear systems of conies. 305. 

 WAALS (j. D. VAN D E e). Simple deduction of the characteristic equation for sub- 

 stances with extended and composite molecules. 138. 



— presents a paper of Mr. N. J. van der Lee: //The influence of pressure on 

 the critical temperature of complete mixture." 158. 



— Variation of volume and of pressure in mixing. (I) 179. (II) 232. (Ill) 390. 



— On the accurate determination of the molecular weight of gases from their 

 density. 198. 



— An anomaly in the course of the plaitpointcurve in a mixture of anomalous 

 substances. 385. 



— On the deduction of the characteristic equation. 408. 



— law of continuity (On the deviation of de Heen's experiments from). 82. 



— (Calculation of the second correction to the quantity b of the equation of con- 

 dition of). 273. 



— (On the characteristic equation of). 398. 



WATER formed in gelatine (The condition of substances insoluljle in). 39. 



WIABDI BECKMAN (j.) and C. WiNKLER. The ett'ect produced upon respi- 

 ration by faradic excitation of some nerve-tracts. 361. 



WIND (c. H.). On maxima and minima of apparent brightness resulting from optical 

 illusion. 7. 



— On the influence of the dimensions of the source of light in difl'raction plieno- 

 mena of Fresnel and on the difi'raction of X-rays. 65. 



— and H. Haga. On tiie diffraction of X-(RöNTGEN)rays. 321. 420. 

 WINKLER (c). Attention and Respiration. 121. 



— and J. WiARDi Beckman. The effect produced upon respiration by faradic 

 excitation of some nerve-tracts. 361. 



