VI CONTENTS 



Nerve (On the regeneration of sensitive end-corpuscles after section of 



the). 319. 

 Onnes (H. Kamerling h) and W. Tuijn. Further experiments with liquid 



helium. Q. On the electric resistance of pure metals etc. X. Measure- 

 ments concerning the electric resistance of thallium in the temperature 



field of liquid helium. 443. 

 — and W. 'luiJN. Further experiments with liquid helium. R. On the 



electric resistance of pure metals etc. XI. Measurements concerning the 



electric resistance of ordinary lead and of uranium lead below 14° 



K. 451. 

 OoRDT (G. J. VAN). On the morphology of the testis of Rana fusca 



Rösel. 99. 

 Orthognathism (The problem of). 371. 

 Otolithic apparatus (A further contribution concerning the function of 



the). 256. 

 Permeability (Calculations of the efifective) and dielectric constant of a 



powder. 293. 

 Phylogenetic and ontogenetic increase of the volume of the brain in 



vertebrata. 230. 

 Planes of symmetry (Axes of rotation and) of quadratic surfaces of revolution 



through 5, 6 and 7 given points. 61. 

 Point space (Numbers of circles touching plane curves defined by represent- 

 ation on), 221. 

 Potassium (A connection between the spectra of ionized) and argon. I. 67. 

 PoTASSiUMiONs (On the significance of calcium- and) for the artificial oedema 



and for the lumen of the bloodvessels. 145. 

 Powder (Calculations of the effective permeability and dielectric constant 



of a). 293. 

 Primates (On the significance of the supraorbital ridges in the). 16. 

 Psychological and physiological phenomena (Concordance of the laws of 



some). 423. 

 Pyridine (The action of sodiumamide on), and some properties of a-ami- 



nopyridine. 458. 

 Quantization (A remarkable case of). 2. 

 Quantum mechanism (On Whittaker's) in the atom. 414. 

 Querido (A r I e). On the progress of the veratrin-poisoning of the striated 



frog-muscle. 364. 

 Rana fusca (On the morphology of the testis of) Rösel. 99. 

 Rays (Representation of a bilinear congruence of twisted cubics on a bilinear 



congruence of). 22. 

 Relativity (On the light path in the general theory of). 288. 

 Respiratory oscillations (On) in the galvanogram of man. 225. 



