Il CONTENTS 



BoËSEKEN (J.). The dislocation theory of catalysis. 210. 



Bolk (L.). On the significance of the supra-orbital ridges in the primates. 16. 



— The problem of orthognathism. 371. 

 BouTER (De) (On a new clinostat after). 475. 



Brain (Phylogenetic and ontogenetic increase of the volume of the) in 



vertebrata. 230. 

 Breit (G.) and P. Ehrenfest. A remarkable case of quantization. 2. 



— Calculations of the efifective permeability and dielectric constant of a 

 powder. 293. 



Bremekamp (C. E. B.). Further researches on the antiphototropic curva- 

 tures occurring in the coleoptiles of Avena. 158. 



Brouwer (H. A.). Fractures and faults near the surface of moving geanti- 

 clines. 11. Abnormal strikes near the bendingpoints of the horizontal 

 projection of the geanticlinal axis. 327. 



Burg (J. H. N. van der) and P. van Romburgh. Cyclic derivatives of 

 mannitol. 335. 



BuiJ TEN DIJK (F. J. J.). A contribution to the physiology of the electrical 

 organ of Torpedo. 131. 



Bijvoet (J. M.) and A. Karssen. Research by means of Röntgen-rays on 

 the structure of the crystals of lithium and some of its compounds 

 with light elements. II. Lithium-hydride. 27. 



Calcium- and potassiumions (On the significance of) for the artificial oedema 

 and for the lumen of the bloodvessels. 145. 



Calcium output (On the influence of the compositon of the food on the). 395. 



Catalysis (The dislocation theory of). 210. 



— (Heterogeneous) and the orientation of adsorbed molecules. 324. 

 Catalyst (The influence of a) on the thermodynamic quantities regulating 



the velocity of a reaction. 199. 



Clinostat (On a new) after de Bouter. 475. 



Coagulation-time of blood (An objective method for determining the). 127. 



Coleoptiles of Avena (Further researches on the antiphototropic curva- 

 tures occurring in the). 158. 



Congruence of rays (Representation of a bilinear congruence of twisted 

 cubics on a bilinear). 22. 



Crystals (Research by means of Röntgen-rays on the structure of the) of 

 lithium and some of its compounds with light elements. II. Lithium- 

 hydride. 27. 



— (Explanation of some interference-curves of uni-axial and bi-axial) by 

 superposition of elliptic pencils. III. 81. 



Crystal structure (The) of germanium. 125. 

 Cuba, the Antilles and the Southern Moluccas. 263. 



