GO NTE NL Ss XXXV 
WEBER (MAx) presents a paper of Prof. J. VERSLUYS and R. DEMOLL: 
“Die Verwandtschaft der Merostomata mit den Arachnida und den 
anderen Abteilungen der Arthropoda.” 739. 
WeEEVERS (TH.). On the calcifuge plants of the inland dunes of the 
island of Goeree. 475. 
Went (F. A. F. C.) presents a paper of Dr. TH. WeEeEveErRs: “On the 
calcifuge plants: of the inland dunes of the island of Goeree.” 475. 
— presents a paper of Miss Dr. CLARA ZOLLIKOFER: “Ueber die tropis- 
tische Wirkung von rotem Licht auf Dunkelpflanzen von Avena sativa.” 577. 
— presents a paper of Mr. M. PiNKkHor: “A new method of recording 
the modifications in aperture of stomata.” (first comm.). 1303. 
WERTHEIM SALOMONSON (I. K. A). v. SALOMONSON (I. K. A. 
WERTHEIM). | 
WING-DESIGN (The) of mimetic butterflies. 877. 
Wincs (The colour-markings on the body of Lepidoptera, compared to 
those of their larvae and pupae, and to those of their). 363. 
WINKLER (C.) presents a paper of Mrs. F. Roers and J. FELDBRUGGE: 
“On the development of attention from the 8 until and including the 
12th year of life.” 1371. 
WOERDEMAN (M. W.). On a human ovary with a large number of ab- 
normal follicles and the genetic significance of this deviation. 448. 
— An inquiry into the distribution of potassium-compounds in the electric 
organ of the Thorn-back (Raja clavata). 842. 
Worrr (J.). On the theorem of PicARD. 585. 
W oUDE (W. VAN DER). On the motion of a fixed system. 589. 
X-rays (Investigation by means of) of the crystalstructure of sodium-chlorate 
and sodium-bromate. 644. : 
YEAR OF LIFE (On the development of attention from the 8t» until and 
including the 12th), 1371. 
ZAHL (Besitzt jede reelle) eine Decimalbruchentwickelung? 955. 
ZANSTRA (H.). Motion relativated by means of a hypothesis of A. 
Förrer. 1412. 
ZEEHUISEN (H.) and H. ZWAARDEMAKER. On Spray-electricity of solutions 
of electrolytes. 658. 
ZEEMAN (P.) presents a paper of Prof. A. Smits: “On the validity of the 
law of partition for the equilibrium between a mixed-crystal phase 
and a coexisting liquid.” I. 679. 
— presents a paper of Prof. A. Smits and J. SPUYMAN: “The thermo- 
electric determination of transition points.” I. 687. 
— presents a paper of Prof. A. Smits and G. J. DE GRUYTER: “The 
electromotive behaviour of aluminium.” II. 966. 
