XXIV CONTENTS. 



UNITY of all the substances (A new relation between the critical quantities and on the) 

 in their thermic behaviour. 808. 924. 104-7. 



UREA (Concerning combinations of) with acids. 555. 



uvEN (m. j. van). The theory of Bravats (on errors in space) for polydimensional 

 space, with applications to correlation. 1124. 



valkenburg (c. t. van) and L. H. J. Mestrom. On the visual centra in the 

 brain of an anophthalmos. 186. 



vapour pressure (The) of solid and liquid argon from the critical pointdown to -206°C. 477. 



VAPOUR pressure LINES (On the) of the system phosphorus. I. 1174. 



VAPOUR PRESSURES of substances of low critical temperature at low reduced tempera- 

 tures. I. Vapour pressure of carbon dioxide between — 160° C and — 183°C. 215. 



— at very low reduced temperatures. II. Vapour pressure of carbon dioxide in 

 the range from —140° C. to about 160° C. 445. 



— (The) of hydrogen from the boiling point down to near the triple point. 440. 

 VARIATIONS OF STATE in gelatin solutions. 418. 



VELOCITY of light (On the constancy of the). 395. 



V E R K A D E (p. E.) and J. EöESEKEN. The mechanism of the acid formation of 



aliphatic acid anhydrides in an excess of water. 718. 



V E K M E u L E N (h. A.). Note on the size of the dorsal motor nucleus of the Xth 



nerve in regard to the development of the stomach. 305. 

 VERTEBRATES (On the relation between the quantity of brain and the size of the 



body in). 647. 

 VESTiBULARY CONNECTIONS (Rolling movements and the ascending) (Fasciculus Deiters 



Ascendens). 338. 

 VIRIALCOEFFJCIENT B (The) for normal butane. 350. 

 viscosiMETER and volatile liquids. 75. 

 VISCOSITY of gas-mixtures (The ditiusion-coefticient of gases and the). 1162. 



— of the vapour (The) of normal butane. 355. 



viscUM ALBUM (On the regulation of the transpiration of) and Rhijisalis cassytha. 1008. 

 VISSER (s. w.) and J. P. Kuenen. Viscosimeter and volatile liquids. 75. 



— The virial coefficient B for normal butane. 350. 



— The viscosity of the vapour of normal butane. 355. 

 VISUAL CENTRA (On the) in the brain of an anophthalmos. 186. 



vixsEBOXE (h) "On the pseudo system methylrhodanide-methyl-mustard oil''. 33. 



vos VAN s T E E N AV IJ K (j. E D e). Investigation of the inequalities of approxi- 

 mately monthly period in the longitude of the moon, according to the meridian 

 observations at Greenwich. 124. Part 2. 141. Addendum. 890. 



— (On the significance of ihe term in the right ascension of the moon, found by). 144. 

 VRiEs (hk. ue) and G. Sciiaake. Ou the singular solutions of ordinary and partial 



diftereiitialequations of the first order. 1152. 

 VRlEs (j A N D e). Bilinear congruences and complexes of plane algebraic curves. 726. 



— A bilinear congruence of twisted quartics of the first species, 733. 



— Cubic involutions in the plane. 974. 



— A bilinear congruence of rational twisted quartics. 1186. 



