C o K T F, N T S. XXV 



WAALS (v A ^' der) (Ou tlie equations of Clausiüs and) for tlie mean lenj>th of 

 path and llie nuuiber of (jollisions. 787. 



— 4**811111106 (C'ontril)utious to tlie knowledge of). Vli. The eijiiations of state and 

 the »J/-suiface in the immediate neighbourhood of the critical state for binary 

 mixtures witli a small proportion of one of the components (part 3). 59. (part 4). 

 115. Vin. The ^'-surface in the neiglibourhood of a binary mixture which behaves 

 as a pure substance. 649. 



— equation of state (On). 794. 



WAALS (.T. D. VAN D E u). The liquid state and the equation of condition. 123. 



— The equilibrium between a solid body and a fluid phase, especially in the 

 neighbourhood of the critical state. 230. 2iid part. 357. 



— presents a paper of Prof. J. P. Kuenek : "On the critical mixing-point of the 

 two liquids." 387. 



— presents a paper of 0. H. Brinkman : ''The determination of the pressure with 

 a closed airmanometer." 510. 



— presents a paper of Prof. H. E. J. G. dtj Bois : "Hysteretic orientatic-pheno- 

 mena". 597. 



— presents a paper of Dr. Ph. Kohnstamm : "On the equations of Claustds and 

 VAN DER Waals for the mean length of path and the number of collisions." 787. 



— presents a paper of Dr. Ph, Kohnstamm : "On van der Waals' equation of 

 state." 794. 



— presents a paper of Miss J. Reudler : "Note on Sydney Young's law of distil- 

 lation." 807. 



WATER (Facts leading to trace out the motion and the origin of the underground) 

 in our sea-provinces. 738. 



— (The electrolytic conductivity of solutions of sodium in mixtures of ethyl- or 

 methylalcohol and). 104. 



WEBER (m a x). On some of the results of the Siboga- Expedition. 846. 



WEEVERS (th.) nnd Mrs. C. J. ^Veevers — de Graaff. Investigations of some 

 Xanthine derivatives in connection with the internal mutation of plants. 2')3. 



WENT (f. a. f. 0.) presents a paper of Dr. G. Grijns : "The Ascus-form of Asper- 

 gillus fumigatus Fresenius." 312. 



WEUTHEIM SALOMON SON (j. K. A.). A new law concerning the relation between 

 stimulus and efl'ect. 73. 



— On tactual after-images. 481. 



w I L l I o T (v.). — Extract of a letter of — on the work of D, Bierens de Haan : 

 "Theorie, propriétés, formules de transformation et methodes d'cvaluation des 

 intégrales détinies." 226. 



w I N D (c. H.). Extract from the Keport made by the Committee for awarding the 

 Buys — Ballot medal. 78. . ^ 



WINKLER (c.) presents a paper of Prof. J. K. A. Wertheim Salomonson : "A 

 new law concerning the relation between stimulus and ell'ect." (6th Communi- 

 cation). 73. 



