COON EREN Tess XV 
VRIES (JAN DE) presents a paper of Prof. L. GEGENBAUER: „On the theory of the 
biquadratie rest.” 169. 
— The number of conics intersecting eight given right lines. 181. 
— presents a paper of Dr. S. L. van Oss: „The elementary motion of space 
S,?. 218. 
— A formula for the volume of the prismoid. 337. 
— Right lines on surfaces with multiple right lines. 577. 
WAALS (VAN DER) y-surface (Contributions to the knowledge of). V. The depen- 
dence of the plait-point constants on the composition in binary mixtures with 
small proportions of one of the components. 293. VL. The increase of pressure 
at condensation of a substance with small admixtures. 659. 
WAALS (J. D. VAN DER) presents a paper of Dr. Pu. Konnstamm and B. M. 
VAN DALFSEN: /Vapourtensions of mixtures of ether and chloroform’. 156. 
— presents a paper of Dr. Pa. A. Kounstamm: „The shape of an empiric 
isothermal of a binary mixture.” 320. 
— Ternary systems. I. 448. II. 539. III, 681. 
— presents a paper of Mr. J. J. van Laar: „On the asymmetry of the electro- 
eapillary curve.” 560. 
water (The densities of mixtures of hydrazine and). 756. 
WATERJACKET (A) of constant ordinary temperature. 29. 
WAVES OF LIGHT (Plane) in an homogeneous, electrically and magnetically anisotropic 
dielectric. I. 49. Il. 148. 
WERTHEIM SALOMONSON (J. k. a.). A new law concerning the relation of 
stimulus and effect. I. 341. [T. 381. IIL. 469, 
— On the effect as a time function. 647. 
WILTERDINK (J, A.). Preliminary report of the Dutch expedition to Karang 
Sago (Sumatra). 593. 
WINKLER (C.) presents a paper of Dr. J. K. A. WrerrHeim SALOMONSON: vA new 
law concerning the relation of stimulus and effect”. I. 341. IL. 381. III. 469. 
— presents a paper of Dr. J. K. A. WeRTHEIM SALOMONSON: „On the effect as 
a time function”. 647. 
— and G. van RIJNBERK. On function and structure of the trunkdermatoma. 
I. 266. II. 308. IIL. 509. 
WOLFF (L. K.) and A. Smirs. On the repelling of the ionisation of solutions of 
Na OH, Nag CO; and Na HCO, by addition of NaCl, 42. 
ZEEMAN (P.). Some observations on the resolving power of the MicueLsoN echelon 
spectroscope. 247. 
— presents a paper of Mr.J. W. Girray: „The effect of the induction coil in tele- 
phonic apparatus”. 1. 357, IL. 400. 
Zoology. A. A. W. Husrecut: „On the gastrulation and the formation of the mesoblast 
in mammals’. 161. 
— P. P. C. Hork: «The unfavourable condition of which complain the oyster 
cultivators on the Eastern-Schelde”. 379. 
