CONTENTS. IX 



L O B R Y I) E B u u Y N (c. A.) presents a paper of Pr. J. Potter van Loon : "Benzi- 

 dine transformation." 377. 



— presents a paper of Mr. A. H. J. Belzkr: "The velocity of transformation of 

 tribrooraphenol bromine into tetrabromophenol." 556. 



— presents a paper of Mr. E. H. Büchner : "Tlie transfornuition of diplienylio- 

 doniura iodide and chloride and its velocity". 04(5. 



— presents a paper of Dr. J. J. Blanksma: "Nitration of symmetrical dinitro- 

 anisol". 650. 



— and W. Alberda van Ekekstein. Formaldehyde (methylene)- derivatives of 

 sugars and glucosides. 175. 



— and E. Cohen. The conductive power of hydrazine and of substances dissolved 

 therein. 551. 



— and J. \V. DiTO. The boilingpoint-curve of the system: hydrazine + water. 171. 



— and C. L. Jungius. Dissociation in and crystallisation from a solid solu- 

 tion. 64.3. 



LOON (j. POTTER VAN). See PoTTER VAN LoON (J.). 



LORENTZ (h. a.). The fundamental equations for electromagnetic phenomena in 

 ponderable bodies, deduced from the theory of electrons. 254. 



— presents a paper of Mr. A. H. Sirks: "Some remarkable phenomena, concerning 

 the electric circuit iu electrolytes". 465. 



— Contributions to the theory of electrons. (I). 608. 



— On the emission and absorption by metals of rays of heat of great wave- 

 lengths. 666. 



MAGNETO-OPTIC Constants (The value of some). 438. 



MARTIN (k.) presents a paper of Prof. EuG. Dubois: "Geological structure of the 



Hondsrug in Drenthe and the origin of that ridge." (I). 93. 

 Matliematics. P. H. Schoute : "On the connection of the planes of position of the 



angles formed by two spaces Sn passing through a point and incident spacial 



systems," 53. 



— S. L. VAN Oss : "Five rotations in S^ in equilibrium." 362. 



— J. Cardinaal : "On the geometrical representation of the motion of variable 

 systems." 386. 



— Jan de Vries : "On the spheres of Monge belonging to ordinary and tangential 

 pencils of quadratic surfaces." 484. 



— P. H. Schoute : "Relations between diagonals of par,nllelotopes." 540. 



— J. C. Kluyver : "An analytical expression for the greatest common divisor of 

 two integers." 658. 



MEASUREMENTS on the magnetic rotation of the plane of polarisation in liquefied 

 gases under atmospheric pressure. II. Measurements with methylchloride. 243. 



MELTING-POINT-LINE (The course of the) of solid alloys or amalgams. (I). 424. 

 (11). 511. 



METAL-ETCHING (On the advantage of) by means of the electric current. 219. 



METALS (On the emission and absorption by) of rays of heat of great wave-lengths. 666. 



METHOD (A new) for demonstrating cartilaginous mikroskeletons, 47. 



