CONTENTS XVII 
WAALS (J. D. VAN DER) presents a paper of Mr. A, KrrsinG: “On plaitpoint 
temperatures of the system water-phenol.” 394. 
— presents a paper of Prof. J.°D. van per Waats Jr.: “On the law of the par- 
tition of energy in electrical systems.” 580. 
— presents a paper of Prof. Pu. Kounstramm: “On the course of the isobars of 
binary systems.’ 599. IL, 799. LI. 906. 
— presents a paper of Prof. Pu. KounstamMm and J. Cur. Reepers: “On the phe- 
nomena of condensation for mixtures of carbonic acid and urethane, in connection 
with double retrograde condensation.” 913. 
WAALS Jr. (J. D. VAN DER) On the law of molecular attraction for electrical 
double points. 132. 315. 
— On the law of the partition of energy in electrical systems. 580. 
WATER at 30° (The system: Copper sulphate, Copper chloride, Ammonium sulphate, 
Ammonium chloride and). 615. 
WATER-PHENOL (On plaitpoint temperatures of the system). 394. 
WEBER (MAX) presents a paper of Miss Winirrep EK. Cowarp: “On Ptilocodium 
repens a new gymnoblastic hydroid epizoic on a pennatulid’’. 635. 
WEEDER (J.). The investigation of the weights in equations according to the prin 
ciple of the least squares. 142. 
weicHts (The investigation of the) in equations according to the principle of the 
least squares, 142. 
WENCKEBACH (K. F.) presents a paper of Dr. P. H. Eykman: “New methods 
of stereoscopy”. 832. 
WENT (F. A. F. C.). On the investigation of Mr. A. H. Buaauw on the relation 
between the intensity of light and the length of illumination in the phototropic 
curvatures in seedlings of Avena Sativa. 230. 
— presents a paper of Mr. J. M. Grerts: “Contribution to the knowledge of the 
cytological development of Oenothera Lamarckiana’”’. 267. 
— Some remarks on Sciaphila nana Bl. 590, 
-WIBAUT (J. P.) and A. Smrrs. The dynamic conception of a reversible chemical 
reaction, 162. ; . 
WICHMANN (A.) presents a paper of Mr. J. Scumutzer: “The mineralogic and 
chemical composition of some rocks from Central Borneo”. 398. 
WINKLER (C.). The nervous system of a white cat, deaf from its birth, A contri- 
bution to the knowledge of the secondary systems of the auditory nerve-fibres. 
225. 
WINKLER (c.) and D. M. van Lonpen. About the function of the ventral group 
of nuclei in the thalamus opticus of man. 295. 
ZEEMAN-EFFECT (The) of the strong lines of the violet spark spectrum of iron in the 
region A 2380—aA 4416. 222. 
— (Remarks on the Leyden observations of the) at low temperatures. 360, 
ZEEMAN (P.) presents a paper of Mrs. H. B. vaN BILDERBEEK-VAN Meurs: “The 
ZeeMan-ellect of the strong lines of the violet spark spectrum of iron in the 
region A 2380—a 4416”. 222, 
