COKTENTS. XIX 



in the liquid phase for binary mixtures in the ciise that the molecules of one 

 component exert only a feeble attraction, 274. 

 WAALS (j. 1). VAN der). Contribution to the theory of binary mixtures. IV. 50. 

 V. 123. VI. 1S3. 



— presents a paper of Prof. J. D. van ber Waals Jr.: "The value of the self- 

 induction according to the electron-theory". 850. 



waals Jr. (j. D, VAN der). The value of the self-induction according to the 

 electron-theory. 850. 



wavelength (Change of) of the middle line of triplets. 574. 2nd part. 862. 



weerman (r. a.). Action of Potassium hypochlorite on Cinnaraide. 2nd Communi- 

 cation. 308. 



WENT (f, a. f. c.) presents a paper of J. van Beusekom : "On the influence of 

 wound stimuli on the formation of adventitious buds in the leaves of Gnetum 

 Gnemon L." 168. 



— presents a paper of Dr. W. Docters van Leeuwen and Mrs. J. Docters van 

 Leeuwen-Reunvaan: "On a double reduction of the number of chromosomes 

 during the formation of the sexual cells and on a subsequent double fertilisation 

 in some species of Polytrichum", 359. 



— The development of the ovule, embryo-sac and egg in Podoscemaceae. 824. 



w I c H M A N N (c. E. A.) presents a paper of L. Rutten : " On fossil Trichechids 

 from Zealand and Belgium". 2. 



— On ore veins in the province of Limburg. 76. 



— presents a paper of J. Scumutzer : "About the oblique extinction of riiombic 

 crystals". 368. 



— presents a paper of J. Schmutzer: "On the terms Schalie, Lei and Sijhist". 432. 

 WIND (c. H.) presents a paper of Dr. E. van Everdingen Jr.: "Relations between 



mortality of infants and high temperatures". 296. 



WINKLER (c.) presents a paper of Dr. G. van Runberk : ''On the segmental skin- 

 innervation by the sympathetic nervous system in vertebrates, based on experi- 

 mental researches about the innervation of the pigment- cells in flat lishes and of 

 the pilo-motor muscles in cats". 332. 



— presents a paper of Dr. S. J. de Lange : "On ascending degeneration after 

 partial section of the spinal cord". 386. 



WOUND STIMULI (On the influence of) on the formation of adventitious buds in the 

 leaves of Gnetum Gnemon L. 168. 



w IJ 11 E (j. W. v A n). On the existence of cartilaginous vertebrae in the development 

 of the skull of birds. 14. 



Y before Amsterdam (The height of the mean sea-level in the) from 1700 — 1860.703. 



ZANDDILUVIUM (Considerations on the Staringian). 108. 



ZEALAND (On fossil Trichechids from) and Belgium. 2. 



ZEEMAN (p.). The intensities of the components of spectral lines divided by mag- 

 netism. 289. 



— Magnetic revolution of spectral lines and magnetic force. 2nd part. 351, 



