XVI CONTENTS. 
WAALS (J. D. VAN DER) presents a paper of Dr. G. BAKKER: vA remark on 
the molecular potential function of Prof. van per Waars.” 163. 
Ae-tr-+ Beg 
— presents a paper of Dr. G, BAKKER: /The potential function ¢(7) = 
7 
and o(r) = es and the potential function of VAN DER Waats.” 247. 
— presents a paper of J. D. VAN DER Waats Jr.: „The Entropy of Radiation.” 
1. 308. IL. 413. 
— The cooling of a current of gas by sudden change of pressure. 379. 
— presents a paper of H. Hursuor: „The direct deduction of capillary constant « 
as a surface-tension.” 389, 
— presents a paper of J. D. van per Waars Jr.: Equations in which functions 
occur for different values of the independent variable.” 534. 
WAALS JR. (J. D. VAN DER). The Entropy of Radiation. [. 308. IL. 413. 
— Equations in which functions occur for different values of the independent 
variable, 534. 
WATER-Phenol (The constitution of the vapourphase in the system), with one or with 
two liquidphases. 645. 
— Phenol, Acetone (On the system). 1. 
— (On the influence of) on the velocity of the formation of ether. 23. 71. 
WEEDER (J.). The 14-monthly period of the motion of the pole of the earth from 
determinations of the azimuth of the meridian marks of the Leiden Observatory 
from -1882—1896. 546. 
WINKLER (c.) presents a paper of Dr. P. H. Eykman: 7A new graphic system 
of Craniology.” 327. 
— presents a paper of M. A. vAN MELLE: „Some reflexes on the respiration in 
connection with LaABORDE’s method to restore, by rhythmical traction of the 
tongue, the respiration suppressed in narcosis.” 640. 
woap (lsatis tinctoria) (On the formation of indigo from the). 120. 
WIJHE (J. W. VAN). A simple and rapid method for preparing neutral Pikro 
carmine. 409. 
ZAAIJER (T.) presents a paper of Prof. W. EiNTHOvEN : „On the theory of LippMANn’s 
capillary electrometer.” 108. 
ZEEMAN-EFFECT (The elementary theory of the). 52. 
ZEEMAN (e.). Some observations concerning an asymmetrical change of the spectral 
lines of iron, radiating in a magnetic field. 298, 
Loology. J. F. van BEMMELEN: /The results of a comparative investigation concerning 
the palatine-, orbital- and temporal regions of the Monotreme skull” (communi- 
cated by Prof. A. A. W. Husrecar). 81. 
ZWIERS (H. J.). The system of Sirius according to the latest observations. 6. 
— (On the finding back of the comet of Honmes according to the computations 
of). 69. 
