CONTENTS. V 



DISTURBANCE FUNCTION (The) in the neighbourhood of the critical state. 603. 



DOCTERS VAN LEEUWEN (w.) and Mrs. J. DoCTERS VAN LeEUWEN-ReYNVAAN. 



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 



Polytrichura. 359. 

 DULiCHiUM VESPiFORMB sp. NOV. (On) from the brick-earth of Tegelen. 860. 

 earth-currents at Batavia (Registration of) for the investigation of the connection 



between earth-current and force of earth-magnetism. 513. 2nd part. 782. 

 EGG (The development of the ovule, embryo-sac and) in Podosteraaceae. 824. 

 El MER (Physiological regeneration of neurofibrillar endnets (tactile discs) in the 



organ of) in the mole. 452. 

 einthoven (w,). On a third heart sound. 93. 

 EiNTHOVEN (w.) and W. A. Jolly. The electric response of the eye to 



stimulation by light at various intensities. 698. 

 E L D I K T II I E M E (b. w. VAN). The actiou of concentrated sulphuric acid on 



glycerol esters of saturated monobasic fatty acids. 855. 

 ELECTRIC RESPONSE (The) of the eye to stimulation by light at various intensities. 698. 

 ELECTRON-THEORY (The value of the self-induction according to the). 850. 

 E LI AS (g. j.) and H. E. J. G. DU Bois. The influence of temperature and magne- 

 tisation on selective absorption spectra. 578. 11. 734. 111. 889. 

 E L I A s (g. j.), p. Lowe and H. E. J. G. du Bois. An auto-coUimating spectral 



apparatus of great luminous intensity. 129. 

 EMBRYO-SAC (The development of the ovule) and egg in Podostemaceae. 824. 

 ENDNETS (tactile discs) (Physiological regeneration of neurofibrillar) in the organ of 



EiMER in the mole. 452. 

 ENZYMES (A method to extract) and pro-enzymes from the mucous membrane of the 



digestive tube and to establish the topic distribution of them. 250. 

 EQUATION OF STATE (On the) of a substance in the neighbourhood of the critical point 



liquid-gas. I. The disturbance function in the neighbourhood of the critical state, 



603. II. Spectrophotometrical investigation of the opalescence of a substance in 



the neighbourhood of the critical state. 611. 

 EQUILIBRIA in quaternary systems. 817. 

 ERRATUM. 239. 329. 366. 533. 623. 865. 



EVERDINGEN JR (e, van). Relations between mortality of infants and high tem- 

 peratures. 296. 

 EXPANSION of platinum (Some remarks on the) at low temperatures. 342. 

 EXTINCTION (About the oblique) of rhombic crystals. 868. 



EYE (The electric response of the) to stimulation by light at various intensities. 698. 

 p A B I u s (g. H.) and H. Kamerlingh Onnes. Repetition of de Heen's and Teich- 



ner's experiments on the critical state. 215. 

 FABRY and Perot (Observations of the magnetic resolution of spectral lines by 



means of the method of). 440. 

 FERTILISATION (On a double reduction of the number of chromosomes during the 



formation of the sexual cells and on a subsequent double) in some species of 



Polytrichum. 359. 



