VIII CONTENTS 



T u IJ N (W.) and H. Kamerlingh Onnes. Further experiments with liquid 

 helium. O- 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 H. Kamerlingh Onnes. 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. 



Twisted cubics (Representation of a bilinear congruence of) on a bilinear 



congruence of rays. 22. 

 Veen(H.J.van). Axes of rotation of quadratic surfaces through 4 given points.52. 



— Axes of rotation and planes of symmetry of quadratic surfaces of 

 revolution through 5, 6 and 7 given points. 61. 



Veratrin-poisoning (On the progress of the) of the striated frog-muscle. 364. 

 Vertebrata (Phylogenetic and ontogenetic increase of the volume of the 



brain in). 230. 

 Waerden (B. L. van der). Ueber Determinanten aus Formenkoefti- 



zienten. 354. 

 W E I N B E R G (A. A.). On respiratory oscillations in the galvanogram of man. 225. 

 Weitzenböck (R.). Ueber Wirkungsfunktionen. 166. 

 Went (F, A. F. C). On a new clinostat after de Bouter. 475. 

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

 Wibaut (J. P.) and Elisabeth Dingemanse. The action of sodiumamide 



on pyridine, and some properties of x-aminopyridine. 458. 

 Wiersma (E. D.). Concordance of the laws of some psychological and 



physiological phenomena. 423. 

 Wolff (L. K.) and J. W. Janzen. Studies on the bacteriophagus of 



d'Herelle. 31. II. 87. III. 171. 

 WoLVius (R. J.). An objective method for determining the coagulation- 

 time of blood. 127. 

 Wo L zogen Kühr (C. a. H. von) v. Kühr (C. A. H. von Wolzogen). 

 Woud E (W. van der). On the light path in the general theory of relativity. 288. 

 Zande (J. E. van der) and B. Sjollema. Changes in milk due to sterile 



inflammation of the udder. 275. 



— and B. Sjollema. Concerning the synthetic action of bacteria in the 

 paunch of the cow. 482. 



Zeeman (P.) and H. W. J. Dik. A connection between the spectra of 



ionized potassium and argon. I. 67. 

 Zwaardemaker (H.). On the alpha-automaticity of the autonomous organs. 152. 



