XXII CRORNEDRERN BRS 
VERSTEEGH (C. R. J.) and A. pe KrLEyYN. On the question whether or 
no Darkness-nystagmus in dogs originates in the Labyrinth. 393. 
Virus (On the so-called filtrable) of influenza described by VON ANGERER. 172. 
VOLUME- and heat-effects (Pressure- and temperature-coefficients) in biva- 
riant systems. 526. 
Vries (JAN De). Null systems determined by linear systems of plane 
algebraic curves. 156. 
— Involutions in a field of circles. 379. 
— On an involution among the rays of space. 478. 
— On an involution among the rays of space, which is determined by 
two REYE congruences. 482. 
— presents a paper of Mr. G. SCHAAKE: “On an involution among 
the rays of space.’ 488. 
— On an involution among the rays of space, which is determined by 
a bilinear congruence of twisted elliptical quartics. 493. 
— presents a paper of Dr. C. H. van Os: “An involution of pairs of 
points and an involution of pairs of rays in space.” 580. 
— Quadratic involutions among the rays of space. 634. 
— A Congruence of Conics. 641. 
— presents a paper of Dr. K. W. Rureers: “Complexes of Plane 
Cubics with Four Base Points.” 909. 
— A Congruence of Orthogonal Hyperbolas. 943. 
WATER Vapours (On the relation between the electrical phenomenon in 
cloudlike condensed odorous) and smell-intensity. 175. 
WATERFALL-ELECTRICITY (On Spray-Electricity and). 429. 
WEBER (MAX) presents a paper of Prof. P. N. vAN KAMPEN: “On the 
phylogeny of the hair of mammals”. 140. 
WenrT (F. A. F.C.) presents a paper of Mr. H. L. VAN DE SANDE BAKHUYZEN: 
“Photo-growth reaction and disposition to light in Avena sativa.” 57. 
— presents a paper of Mr. H. W. BERINSOHN: “The Influence of Light 
on the Cell-increase in the Roots of Allium Cepa.” 457. 
WING-DESIGN (The) of Chaerocampinae. 738. 
Wings (The interrelations of the species belonging to the genus Saturnia, 
judged by the colour-pattern of their). 447. 
WINKLER (C.). On Cyclopia with conservation of the Rhinencephalon. 
283. 
Worrr (J.). Some applications of the quasi-uniform convergence on 
sequences of real and of holomorphic functions. 417. 
— On the quasi-uniform convergence. 650. 
— Series of analytical functions. 656. 
