IV CONTENTS 



Brouwer (L. E. J.). Ueber den natiirlichen Dimensionsbegriff. 795. 



Budding (Experimental) in Fungia fungites. 88. 



Burgers (J. M.). On the resistance e.xperienced by a fluid in turbulent 

 motion. 582. 



Caesium (Is) radio-active? 575. 



Carbon (Researches on the nature of the so-called adsorptive power of 

 finely-divided). I. The binding of water by animal carbon. 548. 



Carboniferous (Etapteris Bertrandi Scott, a new etapteris from the upper) 

 (lower coalmeasures) from England, and its bearing to stelar-morpho- 

 logical questions. 669. 



Cardio-regulative nerves (The presence of) in Petromyzon fiuviatilis. 438. 



Central-Atlantic ridge (The horizontal movement of the). 167. 



Chemical causes (Researches on the) of normal and pathological haemo- 

 lysis. 470. 



Chemistry. P. H. Hermans : "Provisional communication on boric acid 

 compounds of some organic substances containing more than one 

 hydro-xyl-group. Boron as a pentavalent element". 32. 



— H. R. Kruyt and W. A. N. Eggink: "The electro-viscous effect in 

 rubbersol". 43. 



— H. J. Backer and J. H. de Boer : "n. y.-Sulfobutyric acid and its 

 optically active components". 79. 



— H. J. Backer: "The second dissociation constant of sulphoacetic and 

 z-sulphopropionic acids". 83. 



— J. Böeseken : "The valency of boron". 97. 



— H. 1. Waterman and J. N. J. Perquin : "Hydrogenation of paraffin 

 by the Bergius' method". 226. 



— A. Smits: "The phenomenon of electrical supertension". III. 259. 



— A. Smits : "The influence of intensive drying on internal conversion". 

 I. 266. 



— A. Smits: "The system sulphur trioxide". I. 270. 



— F. A. H. Schreinemakers : "In-, mono- and divariant equilibria". 

 XXIII. 283. 



— J. P. WiBAUT and J. J. Diekmann : "Researches on the additon of 

 water to ethylene and propylene." 321. 



— A. Smits : "The electromotive behaviour of magnesium." II. 395, 



— J. P. WiBAUT and Miss E. Dingemanse: "The synthesis of some 

 pyridylpyrroles". 426. 



— W. D. Cohen: "The light oxidation of alcohol. III. The photo-catalytic 

 iniluence of some series of ketones on the light oxidation of ethyl 

 alcohol". 443. 



— L. Hamburger: "Nitrogen fixation by means of the cyanide-process 

 and atomic structure". 480. 



