COUN TSN. Es XXI 
VRIES (JAN De) Pencils of twisted cubics on a cubic surface. 97. 
— A simply infinite system of hyperelliptical twisted curves of order five, 271. 
— Two null systems determined by a net of cubics. 1124. 
— presents a paper of Dr. K. W. Watstra: “On a representation of the plane 
field of circles on point-space”. 1130. 
— presents a paper of Dr. Cus. H. van Os: “A quadruply infinite system of 
point groups in space”. 1133. 
WAALS (J. D. VAN DER) presents a paper of Prof. A. Smirs and Dr. A. H. W. 
ATEN: “The application of the theory of allotropy to electromotive equilibria”, 
V. 133. 
— The increase of the quantity a of the equation of state for densities greater 
than the critical density. 359. : 
— presents a paper of Prof. A. Smits and Dr. F. E. C, Scuerrer: “Interpretation 
of the Röntgenograms and Röntgenspectra of crystals”. 432. 
— presents a paper of Dr. F. E. C. Scurrrer: ‘‘On the influence of temperature 
on chemical equilibria”. 636. 
— presents a paper of Prof. J. D. van per Waats Jr.: “On the energy and the 
radius of the electron”. 985. 
WAALS JR. (J. D. VAN DER). On the energy andthe radius of the electron. 985, 
WALSTRA (kK. W.). On a representation of the plane field of circles on point 
space. 1130. 
WATER and of Ammonia (The equation of state of). 932. 
WATERMAN (H. I.). Metabolism of Aspergillus niger. 215. 
— Amygdalin as nutriment for Aspergillus niger. 922, Il. 987. 
WATER vapours (Specific smell intensity and the electrical phenomenon of cloudlike 
condensed) in chemical series. 334. 
— (The electrical phenomenon in cloudlike condensed odorous). 44. 
WEBER (s.) and B. OOSTERHUIS. On the electric resistance of thin films of metal. 597. 
WENT (F. A. F.C.) presents a paper of Miss E. Tauma: “The influence of tempe- 
rature on the growth of the roots of Lepidium Sativum. 61. 
— presents a paper of Dr. J. A. Honine: “Variability of segregation in the 
hybrid”. 805, 
— presents a paper of Dr. U. P, van AMErDEN: “The influence of light- and 
gravitational stimuli on the seedlings of Avena sativa, when free oxygen is wholly 
or partially removed”. 1165. 
WERTHEIM SALOMONSON (I. K. A.). V. SALOMONSON (I. K. A. WERTHEIM). 
WICHMANN (C. £. A.) presents a paper of Dr. L. Rurren: ‘Modifications of the 
facies in the tertiary formation of East Kutei (Borneo)”, 728. 
WIEN’s constant cz (Note on the melting point of palladium and). 549. 
WILLEM (v.). The movements of the heart and the pulmonary respiration with 
spiders. 162. 
WINKLER (C.) presents a paper of Dr. D. J. Hursnorr Por: “The relation of the 
plis de passage of GRATIOLET to the ape fissure”. 104, 
