XXVIII / CON TE N TS 
WEIss (e.) and Miss B. D, Bruins. The magnetic susceptibility and the number of 
magnetons of nickel in solutions of nickelsalts. 246. 
— and Miss C. A, FrANKAMP. Magnetochemical researches on ferrous salts in 
solution. 254. 
WENT (F. A F. C.) presents a paper of Dr. W. and J. Docrers van LEEUWEN- 
ReynvaanN: “On the germination of the seeds of some Javanese Loranthaceae.” 
220. 
— and A. A. L. Rurerrs. On the influence of external conditions on the 
flowering of Dendrobium erumenatum Lindl. 526. 
WERTHEIM SALOMONSON (I. K. A.) v. SALOMONSON (L. kh. A. WerTiteIM). 
WICHMAN (ec. E‚ A.) presents a paper of Dr. C. G. 8S. SANDBERG: “How volcanism 
might be explained”. 10. 
— On phosphorite of the isle of Ajawi. 214. 
WIERSMA (B. D.) On the value of the simultaneous registration of the plethys- 
mogram and the psychogalvanic reaction. 1154. 
WING-MARKINGS (On the phylogenetic significance of the) in Hepialids. 1255. 
WING-PATTERN (A contribution to the knowledge of the phylogeny of the) in Lepi- 
doptera. 1557. 
WINKLER (0.) presents a paper of Dr. H. A. VERMEULEN: “The vagus-area in 
Camelopardalus Giratte”. 647. 
— presents a paper of Dr. H. A. VERMEULEN: “On the conus medullaris of the 
domestic animals”. 780. 
— On the brains of cyclops and monstra related to them. 1399. 
— presents a paper of Dr. F. Rorers: “On inhibition proceeding from a false 
recognition”. 1412. 
— presents a paper of Dr. J. J. L. D. BARON van HöeverL: “The phylogenetic 
development of the cerebellar nuclei”. 1421. 
— presents a paper of Dr. D. J. Hursnorr Por: “The fissura simialis in embryos 
of Semnopitheci”. 1571. 
WOLFF (s.) and Ernst Conen. The allotropy of sodium. |. 91. 
WOLTJER JR. (J.). Observation of the moon during the eclipse of the sun on 
Aug 21, 1914 and of the transit of Mercury on Nov. 7, 1914 made in the Leiden 
Observatory. 16. 
x-rays (A difference between the action of light and of) on the photographie plate. 671. 
ZEEMAN (P.). Fresnuw’s-coefficient for light of different colours. 24 part. 398. 
— The passage of light through the slit of a spectroscope. 412. 
— On a possible influence of the Fresnet-coeflicient on solar phenomena. 711. 
— An optical method for determining the ratio between the mean and maximal- 
velocities in the turbulent motion of fluids in a cylindrical tube. Contribution 
to the experiment of Fizeau. 1240. 
— presents a paper of Dr. T. van LonuizeN: “On the ratio between the ZEEMAN- 
effect and the pressure-effect in the spectrum of nickel”. 1309. 
