VI CONTENTS. 



CRANIUM (The primordial) of Tarsius spectrum. 397. 



CBEA.TININ (On the excretion of) in man. 363. 



CRITICAL LINE (plaitpoint line) (Properties of the) on the side of the cüm[)onents. 271. 



CRYOGENIC LABORATORV (Methods and apparatus used in the). VIL 77. VIll 79. IX. 82. 



CRYOSTAT {A modified). 77. 



— with liquid oxygen for temperatures below — 210° C. 79. 



CRYSTAL (On the propagation of light iu a biaxial) around a centre of vibration. 728. 

 Crystallography. F. M. Jaeger: "On Diphenylhydrazine, Ilydrazobenzene and Eenzyl- 



aniline, and on the miscibility of the last two with Azobenzene, Stilbene and 



Dibenzyl in the solid aggregate condition". 466. 



— P. M. Jaeger: "Contribution to the knowledge of the isomorphous substitution 

 of the elements fluorine, chlorine, bromine and iodine, in organic molecules". 614. 



CRYSTALS (A simple geometrical deduction of the relations existing between known and 



unknown quantities, mentioned in the method of Voigt for determining the con- 



ductibility of heat in). 793. 

 CURVE (The Plücker equivalents of a cyclic point of a twisted). 498. 

 CYCLIC POINT (The Plücker equivalents of a) of a twisted curve. 498. 

 DASYLIRION ACROTRiciiUM zucc. (On a Case of apogamy observed with). 634. 

 DEPOSITS (On brackish and fresh water) of the river Silat in Western-Borneo. 742. 

 DIBENZYL (On Diphenylhydrazine, Hydrazobenzene and Benzylaniline, and on the 



miscibility of the last two with Azobenzene, Stilbene and) in the solid aggregate 



condition. 466. 

 DILUVIUM of Holland (The geographical and geological signification of the Hondsrug, 



and the examination of the erratics in the northern^. 427. 



— of the Netherlands North of the lihine (On fragments of rocks from the Ardennes 

 found in the). 518. 



DIPHENYLHYDRAZINE (On), Hydrazobeuzeue and Benzylaniline, and on the miscibility 

 of the last two with Azobenzene, Stilbene and Dibenzyl in the solid aggregate 

 condition. 466. 



DISSOCIATION CONSTANT of acids (On colorimetry and a colorimetric method for deter- 

 mining the). 166. 



DiviNYLGLYcoL (The reduction of acraldehyde and some derivatives of s.) (3.4 diliy- 

 droxy 1.5 hexadiene). 541, 



DORP (w. A. and g. c. a. v a n). On the chlorides of maleic acid and of fumaric 

 acid and on some of their derivatives. 387. 



DOBS SEN (w. van) and V. van Uombubgh. The reduction of acraldehyde and 

 some derivatives of s. diviiiylglycol (3.4 dihydroxy 1.5 hexadiene). 541. 



— On the simplest hydrocarbon with two conjugated systems of double bonds 

 1.3.5 hexatriene. 565. 



DUBOIS (eu g.). The geographical and geological signification of the Hondsrug, 

 and the examination of the erratics in the Northern diluvium of Holland. 427. 



DYNAMICS of the electron (Remarks concerning the). 477. 



E A 8 T o N (c). Oscillations of the solar activity and the climate. 2od communication. 

 155, 



