li CONTENTS. 



BECQüEREL (jean) and II. Kamf.rlingh Onnes. The absorption spectra of the 

 compounds of the rare earths at the temperatures obtainable with liqu'd liydrogen, 

 and their change by the magnetic field. 592. 



BELGIUM (On fossil Trichechids from Zealand and). 2. 



BEMMELEN (w. V A n). Kegistration of earth-currents at Batavia for the investi- 

 gation of the connection between earth-current and force of earth-magnetism. 

 512. 2nd part. 782. 



— The starting impulse of magnetic disturbances. 773. 



B E u a E K o M (j. van). Ou the influence of wound stimuli on the formation of 

 adventitious buds in the leaves of Gnetum Gnemon L. 1G8. 



BEiJERlNCK (m. w.). On lactic acid fermentation in milk. 17. 



BINARY MlX'iURE (On the course of the plaitpoint line and of the spinodal lines, 

 also for the case, that the mutual attraction of the molecules of one of the com- 

 ponents of a) of normal substances is slight. 34. 



BINARY MIXTURES (Contribution to the theory of). IV. 56. V. 123. VI. 183. 



— (Isotherms of diatomic gases and their). VI. Isotherms of hydrogen between 

 — 104° C. and -- 217° C. 204. Continued. 413. VII. Isotherms of hydrogen 

 between 0° C. and 100° C. 419. 



— (On the gasphase sinking in the liquidphase for) in the case that the molecules 

 of one component exert only a feeble attraction. 274. 



— (Isotherms of monatomic gases and their). I. Isotherms of helium between 

 + 100° C. and - 217° C 445. II. Isotherms of helium at —253° C. and 

 — 259° C. 741. 



BIRDS (On the existence of cartilaginous vertebrae in the development of the skull 



of). U. 

 BLANKSMA (j. J.). Ou the constitution of van Geuns' O.\vinethyldinitrobenzoni- 



trile. 509. 

 B o E K E (j.). On the structure of the nerve cells in the central nervous system of 



Branchiostoma lanceolatura. 1st Communication. 86. 

 BOEK E (j.) and G. J. de Groot. Physiological regeneration of neurofibrillar endnets 



(tactile discs) in the organ of Eimer in the mole. 452. 

 B o I s (h. E. J. G D u) and G. J. Elias. The influence of temperature and magneti- 

 sation on selective absorption spectra. 578. II. 734. III. 839. 

 BOis (h. e. j. g. d u), G. j. Elias and F. Lowe. An auto-coUimating spectral 



apparatus of great luminous intensity. 729. 

 BOLK (l.). Is red hair a nuance or a variety? 321. 

 BOOLE sTOTT (Mrs. A.) and P. H. Schoute. On five pairs of four-dimensional 



cells derived from one and the same source. 499. 

 Botany. J. van Beusekom: "On the influence of wound stimuli on the formation of 



adventitious buds in the leaves of Gnetum Gnemon L". 168. 

 — W. UocTERS VAN Leeuwen and Mrs. J. Docters van Leeuwen— Eeïnva.\.n: 

 "On a double reduction of the number of chromosomes during the formation 



of the sexual cells and on a subsequent double fertilisation iu some species of 



I'olytrichum". 359. 



