XX CONTENTS 



UREASE (The influence of neutral Salts on the action ot"). 55 9. 



VALUES of a and h (On the course of the) for hvdroij^en at dilferent temperatures and 



volumes. 750. II. 1195. 

 VARIABLE COMPLEXE (Sur une propricte des fonctions de). S77. 

 VENTRICLE-ELECTROGRAM (On the) of tlie frogs' heart. 696. 



VERGOUWEN JR. (J. P.)- On the variability of the number of giant pyramidal 



cells in the Heschl convolution in man. 788. 

 VERSCHAFFELT (J. E.). The viscositv of liquefied gases. X. The viscosity of liquid 



hydrogen. 986. 

 VERSLUYS (w. A.). On satellite points on curves, given by the equations: x = arp, 



yr^hfl. 1054. 

 VERTEBRATES (Short historv of the head of). 1005. 



VISCOSITY (.The) of liquefied gases. X. The viscosity of liquid hydrogen. 986. 

 VISSER (j. so HARP de) and G. Holst. The brightness of the black body and 



the mechanical equivalent of light. 1036. 

 VLEUTEN (Miss ANNIE v A n). "Do the forces causing the diurnal variation of 

 terrestrial magnetism possess a potential?" 358. 

 — On the question whether the internal magnetic field, to which the diurnal 

 variation in terrestrial magnetism is partly a.scribed, depends on induced currents". 

 361. 

 VOLUTIN (On the nature and significance of) in yeast-cells. 70. 

 voorhoeve (n.). a hypothesis concerning the mutual relation between some 



hereditary abnormalities that occurr combined. 194. 

 vries (jan d k). Surfaces that may be represented in a plane by a linear 



congruence of rays. 419. 

 waals (j. Ü. van der) presents a paper of Prof. J. D. van der Waals Jr. 



"On the theory of the Brownian movement". 1254. 

 waals jr. (j. d. van der). On the theory of the Brownian movement. 1254. 

 waterman (h. i.). Influence of ditt'erent compounds on the destruction of mono- 

 saccharids by sodiumhydroxide and on the inversion of sucrose by hydrochloric 

 acid. Constitution-formula of a-amino-acids and of betain". 88. II. 382. 



— Amygdalin as nutriment for Fusarium. 185, III. Constitution-formula of the 

 hydroxybenzoic acids and of sulfanilic acid". 581. 



WEBER (max) presents a paper ot' Dr. C. J. van der Horst : "The fore-brain of 

 Synbranchidae". 217. 



WERÏHEIM SALOMON SON (l. K. A.). V. SaLOMONSON (I. K. A.. WeRTHEIM). 



WEST-PROGO MOUNTAINS in Java (On the miocene fauna of the). 800. 

 w I c H M A N N (c. E. A.) presents a paper of Ur. L. Rutten : ""Old Andesites" and 

 "Brecciated miocene" to the east of Buitenzorg (Java)". 597. 



— presents a paper ot Dr. L. Kutten: "On the rate af denudation in Java". 838. 

 w I L L E Ai (v.). On the respiratory movements of the frog. 1234. 

 AVING-MARKINGS (The) of Arctüdae. 849. 



