CONTENTS. V 



CRYOGENIC Liibonitory (Metliods and appiiiiitiis used in the). 111. Balh of very uniform 

 and constant low temperatures in llie cryostat. 502. 628. A cryostat of modified 

 form for apparatus of small dimensions. ü28. [V. A permanent batli of licjuid nitrogen 

 at ordinary and at reduced pressure. 631. V. Arrangement of a Hukckhardt-Weiss 

 vacuumpump for use in the circulations for low temperatures. 633. 



CRYOSTAT (Bath of very uniform and constant low temperatures in the). 502. 628. 



— (A) of modified form for apparatus of small dimensions. 628. 

 CRYST.^LLISATION (Dissociation in and) from a solid solution. 643. 



CURRENT (The iniluence of variation of the constant) on the pitch of the singing arc. 311. 

 D E L D E N (a. V A n) and M. W. Beyerinck. On a colourless bacterium, whose 



carbon food comes from the atmosphere. 3'J8. 

 DIAGONALS of parallelotopes (Relations between). 540. 

 DIFFRACTION of Köutgeu-rays. 247. 

 DILUVIUM (Some new under- cambrian erratic-blocks from tiie Dutch). 561. 



— (Two new mid-caiubriun erratic-blocks from the Dutch). 632. 

 DINITROANISOL (Nitration of symmetrical). 650, 



DISPERSION of sunlight (Peculiarities and changes of FKAUNiioFER-lines interpreted as 



anomalous) in the corona. 589. 

 DISSOCIATION in and crystallisation from a solid solution. 643. 

 DISTHENE (On the behaviour of) and of sillinumite at' high temperature. 240. 

 DITO (j. w.) and C. A. Lobry de Bruyn. The boilingpoint-curve of the system: 



hydrazine -\- water. 171. 

 DUBOIS (k u G.). The geological structure of the llondsrug in Drenthe and the 



origin of that ridge. (I). 93. (II). 101. 

 EFFECT (A new law concerning the relation between stimulus and). 392. 441. 

 EisENKOSE (On an) of the St. Gotthard. 605. 



ELECTRIC CIRCUIT (Somc remarkable phenomena, concerning the) in electrolytes. 465. 

 ELECTRIC CURRENT (On the advantage of metal-etching by means of the), 219. 

 ELECTROLYTE (On the poteutial-dillerence, which occurs at the surface of contact of 



two different non-miscible liquids, in which a dissolved) has distributed itself. 431. 

 ELECTROLYTES (Some remarkable phenomena, concerning the electric circuit in). 465. 

 ELKGTROMAGNETTC PHENOMENA (The fundamental e([uations for) in ponderable bodies, 



deduced from the theory of electrons. 254. 

 ELECTKO-MECiiANics (Statistical). (1). 22. (II). 114. 

 ELECTRONS (Contributions to the theory of. (I). 60S. 



— (The fundamental equations for electromagnetic phenomena in ponderable bodies, 

 deduced from the theory ot). 254. 



EMISSION (On the) and absorption by metals of rays of heat of great wavelengths. 666. 



ENTROPY (riie priuiMple of) in physiology. (11). 57. 



EQUATION OF STATE (The) and the ({«-surface in the immediate neighbourhood of tlie 



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



321. 336. 



— (The variability with the density of the quantity 6 of the). 487. 



