OO NOP ENTS XI 
NITRO-COMPOUNDS (On the action of sodium mono- and -disulphides on aromatic). 271. 
nitrous OXIDE and oxygen (The dielectric coefficients of liquid). 140. 211. 
ONNES (H. KAMERLINGH). See KAMERLINGIL Onnes (H.). 
ORBITAL- and temporal regions of the Monotreme-skull (‘The results of a comparative 
investigation concerning the palatine-,). 81. 
ORTHOGONAL comitants (On). 485. 
OXYGEN (The dielectric coefficients of liquid nitrous oxide and). 140. 211. 
— (Measurements on the magnetic rotation of the plane of polarisation in) at 
different pressures. 19. 
PALATINE-, Orbital- and temporal regions of the Monotreme-skull (The results of a 
_ comparative investigation concerning the). 81. 
PHASES (The determination of the refractivity as a method for the investigation of 
the composition of co-existing) in mixtures of acetone and ether. 101. 
PHENOL (The constitution of the vapourphase in the system: Water-), with one or 
with two liquidphases. 645. 
— Acetone (On the system : Water). 1. 
PHENOMENA (Solar) considered in connection with anomalous dispersion of light. 467. 575. 
Physical geography. J. P. vaN per Srox: „Iwo earth-quakes, registered in Europe 
and at Batavia”. 244. 
Physics. L. H. SrerrseMma: „Measurements on the magnetic rotation of the plane of 
polarisation in oxygen at (different pressures” (communicated by Prof. H. KAMERLINGH 
ONNEs). 19. 
— H. KAMERLING ONNES: „Standard Gasmanometers.” 29. j 
— N. Quixt Gzn: vThe determination of isothermals for mixtures of HCl and 
C,H,” (communicated by Prof. J. D. van per Waats). 40. 
— H. A. Lorentz: The elementary theory of the ZEEMAN-effect.” 52. 
— KE. H. J. Cunarvs: The determination of the refractivity as a method for the 
investigation of the composition of co-existing phases in mixtures of ac2tone and 
ether” (communicated by Prof. J. D. van Der Waats). 101. 
— W. EINTHOVEN: vOn the theory of Lirpmann’s capillary electrometer” (com- 
municated by Prof. T. Zaayer). 108. 
— H. KAMERLINGH ONNES: „Methods and apparatus used in the Cryogenic Labo- 
ratory.” [. 129. II. 406. 437. 
— Frirz Hazexoznru: The dielectric coefficients of liquid nitrous oxile and 
oxygen” (communicated by Prof. H. KAMERLINGH ONNrs). 140. 211. 
— G. BAKKER: vA remark on the molecular potentialfunction of Prof. v. p. Waats” 
(communicated by Prof. J. D. vax per Waats). 163. 
— E. van Everpixcen Jr.: vThe Hatt-eflect and the increase of resistance of 
bismuth in the magnetic field at very low temperatures” (communicated by 
Prof, H. KAMERLINGH ONNES). 228. 229. 348. 
— G. BAKKER: /The potentialfunction gp (7) = er and z(r) = kelde 
and the potentialfunction of van per Waars” (communicated by Prof. J. D. van 
der Waals). 247, 
