j^YIII CONTENTS 



OSCILLATIONS (On the rotational) of a cylinder in an infinite incompressible liquid. 193. 

 OSMOTIC PRESSURE (On the influence of the increase of the) of the fluids of the body 



on diflerent cell-substrata. 151. 

 PANKEKOEK (a.). Expansion of a cosmic gassphere, the new stars and the 



Cepheids. 730. 



— Investigation of a galactic cloud in Aquila. 1323. 



PANTAR and Dammer (East Indian archipelago) (On the Non-existence of Active Vol- 

 canoes between) in Connection with the Tectonic Movements in this Kegion. 795. 



PABA AZOxY-ANisoL (Melting and congelation-phenomena with). Contiibutions to the 

 study of liqnid crystals III. 2B4. 



PARALLAX (On the) of some Stellar Clusters. 36. 



PARALLEL TRANSLATION (On the equivalent of) in non-E.uclidean space and on 

 Eiemann's measure of curvature 505. 



PASSiviTV (The) of Chromium. 3rd Communication. 138. 



— (On the Periodic) of Iron. IL 382. 



p A s T E u r's principle (Investigations on) concerning the Relation between Molecular 

 and Crystallonomical Dissymmetry. VIII. On tlie spontaneous Fission of racemic 

 Potassium-Cobalti-Oxalate into its optically-active Antipodes. 693. 



PEKELHARING (c. A.) presents a paper of Miss M. A. van Herwerden: "Etfects 

 of the Rays of Eadium on the Oogenesis of Daphnia pulex". 540. 



PHENYL Carbaminic Acid (On) and its Homologues. 664. 



PHOSPHATES (On the Secretion of) in the stems of Djatikapur [Tectona grandis L.] 968. 



PHOTO-ELECTRICITY (Oil the) of Gels. 1146. 



Physics. J. J. VAN Laar: "On the Course of the Values of a and fj for Hydrogen at 

 Diflerent Temperatures and Volumes". III. 2. IV. 16. 



— Mrs. T. Khrenfest-Afanassjewa: "An indeterm inateness in tlie interpretation 

 of the entropy as log W". 53. 



— G. Nordstrom: "Calculation of some special cases, in Einstein's theory of 

 gravitation". 68. 



— L. S. Ornstein : "The variability with time of the distributions of Emulsion- 

 particles". 92. 



— L. S. Ornstein: "On the Brownian Motion". 96. 



— L. S. Ornstein and F. Zernike : "The Theory of the Brownian Motion and 

 Statistical Mechanics". 109. 



— L. S. Ornstein and F. Zernike : "The Scattering of Light by Irregular Refraction in 

 the Sun". 115. 



— D. Coster : "On the rotational oscillations of a cylinder in an infinite incom- 

 pressible liquid". 193. 



— I. K. A. VA'ertheim Salomonson : "The Limit of Sensitiveness in the String 

 galvanometer". 235. 



— W. J. H. Moll and L. S. Ornstein: "Contributions to the study of liquid 

 crystals. III. Melting and congelation-phenomena with para-azoxy-anisol". 254. 

 IV. A thermic Eftect of the Magnetic Field. 259. 



— H. C. Burger: "On tho Kvaporation from a Circular Surface of a Liqnid". 271. 



