XIV CON TENTS. 



OSCILLATIONS (lluïüENs' syuipatbiu clocks and related phenomena in connection with 

 the principal and the compound) presenting themselves when two pendulums 

 are suspended to a mechanism with one degree of freedom. 436. 



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

 of its elliptic motion. 642. 



ORBITAL PLANES (On the) of Jupiter's satellites. 767. 



OSMOTIC PRESSURE {Some remarks on Dr. I'h. Kohnstamm's last papers on the). 49. 



— (A method for determining the) of very small quantities of liquid. 394. 



o u D E m A N s (j. A. c). Supplement to the account of the determination of the 

 longitude of St. Denis (Island of Reunion), e.^ecuted in 1874, containing also a 

 oeneral account of the observation of the transit of Venus. 110. 



PARALLAX (On the) of the nebulae. 691. 



PEKELHARING (c. A.). On the excretion of creatinin in man. 3G3. 



— presents a paper of Dr. L. van Itallie; "On catalases of the blood." 623. 



presents a paper of Dr. L. van Itallie: "On the diöerentiation of fluids of the 



body, containing proteid." 628. 

 PENCILS (On) of algebraic surfaces. 29. 



— (Some properties of) of algebraic curves. 817. 



PHASE LINE (On the phenomena which occur when the plaitpoint curve meets the 



three) of a dissociating binary compound. 571. 

 PHASE LINES (The dittereut branches of the three-) for solid, liquid, vapour in binary 



systems in which a compound occurs. 455. 

 PHASE PRESSURE (The shape of the sections of the surface of saturation normal to the 



a; axis, in case of a three) between two temperatures. 184. 

 PHASES (The Tir-equilibria of solid and fluid) for variable values of the pressure. 193. 

 PHENYLCARBAMic ACID (On soms derivatives of). 127. 



Physics. J. J. VAN Laar: "Some remarks on Dr. Ph. Kohnstamm's last papers". 49. 

 Xi. Kameblingh Onnes: "Improvement to the open mercury manometer of 



reduced height with transference of pressure by means of compressed gas" 75. 



— H. Kamerlingu Onnes: "Improvement in the transference of pressure by com- 

 pressed gas especially for the determination of isothermals". 76. 



H. Kamerlingh Onnes: "Methods and apparatus used in the cryogenic laboratory. 



VII. A niodilied cryostat. 77. VIII. Cryostat with liquid oxygen for temperatures 



Ijelow 210° C. 79. IX. The purifying of gases by cooling combined with com- 



pressiou, especially the preparing of pure hydrogen". 82. 



J. D. VAN DER Vy^AALS : ''Tlie shape of the sections of the surface of saturation 



normal to the a;-axis, in case of a three phase pressure between two tempera- 

 tures". 184. 



J. D. VAN DEH VVaals: "The T,x- equilibria of solid and fluid phases for variable 



values of the pressure". 193. 



— A. Smits: "Ou the hidden equilibria in the p,x- diagram of a binary system in 

 consequence of the appearance of solid substances". 196. 



— A. Smits: "Contribution to the knowledge of the p.x- and the pT- lines for the 

 ease that two substances enter into a combiuatiou which is dissociated in th e 

 liquid and the gasphase". 200. 



