C O N T K N T 8. XIII 



nitric acid (Contribution to the knowledge of the action of absolute) on heterocyclic 

 compounds. 600. 



nitrodibromobenzenes (On a new case of form-analogy and miscibility of position- 



isomeric benzene-derivatives, and on the crystalforms of the six). 26. 

 nitrous oxide (Graphical deduction of the results of Kuenen's experiments on 



mixtures of ethane and). 664. 

 non-electrolytes (On the osmotic pressure of solutions of), in connection with the 



deviations from the laws of ideal gases. 53. 

 north-sea (Current-measurements at. various depths in the). 1st Communication. 566. 

 occultations (Mutual) and eclipses of the satellites of Jupiter in 1908. 304. 2nd 



part. 444. 

 osmotic pressure (On the) of solutions of non- electrolytes, in connection with the 



deviations from the laws of ideal gases. 53. 

 oss (s. L. v a n). Equilibrium of systems of forces and rotations in Sp 4 . 820. 

 oudemans (j. a. c). Mutual occultations and eclipses of the satellites of Jupiter 



in 1908. 304. 2nd part. 444. 

 panama-canal (Velocities of the current in an open). 849. 

 pannekoek (a.). The luminosity of stars of different types of spectrum. 134. 



— The relation between the spectra and the colours of the stars. 292. 

 Pathology. H. Eysbroek: "On the Amboceptors of an anti-streptococcus serum." 330. 



— P. Nieuwenhuyse: "On the origin of pulmonary anthracosis." 673. 



pencils (On the locus of the pairs of common points and the envelope of the common 

 chords of the curves of three). 1st part. 424. 2nd part. Application to pencils of 

 conies. 548. 



— (The locus of the pairs of common points of m-{-1) °f ( w — *) dimensional 

 varieties in a space of n dimensions. 573. 



— of conies (Application to). 548. 



— of surfaces (The locus of the pairs of common points of four). 555. 

 perturbations (Researches on the orbit of the periodic comet Holmes and on the) 



of its elliptic motion. IV. 4L4. 

 phase-line (On the shape of the three-) solid-liquid-vapour for a binary mixture. 639. 

 phase-lines (Three) in chloral alcoholate and anilinehydrochloride. 99. 

 phase-transitions (On irreversible) in substances which may exhibit more than one 



liquid condition. 483. 

 phenols (Nitration of raeta-substituted). 278. 

 phosphorus (On catalytic reactions connected with the transformation of yellow) into 



the red modification. 613. 

 Physics. A. Smits : "On the course of the P, '/'-curves for constant concentration for 



the equilibrium solid-fluid." 9. 



— F. M. Jaeger: "Researches on the thermic and electric conductivity power of 

 crystallised conductors." I. 89. 



— H. IIaga: "On the polarisation of Rontgemrays." 104. 



— H. Kamf.rlingu Onnes: "Methods and apparatus used in the Cryogenic Labo- 

 ratory at Leiden. X. How to obtain baths of constant and uniform temperature 



