Index. 401 



Thomson, J. J., On the positive electrification of a rays, and the emission 

 of slowly moving cathode rays by radio-active substances, 49. 



Do the y rays carry a charge of negative electricity ?, 121. 



On the absence of excited radio-activity due to temporary exposure to 



y rays, 124. 



The rate of recombination and the size of gaseous ions, 170. 



Some experiments on Canal-Strahlen, 212. 



— - A theory of the widening of lines in Spectra, 318. 



On secondary Rontgen Radiation, 322. 



Tims, H. W. Marett, A suggestion as to the nature of the Horny Teeth of 



the Marsipobranchii, 383. 

 Two wheels connected by an axle rolling on a rough horizontal plane 



(Leggett), 389. 



Uredineae, Infection phenomena in various species of (Evans), 179. 

 Uric Acid, An attempted Synthesis of (Fenton), 25. 



Velocity and the volume of the ions of certain organic acids and bases 



(Laby and Carse), 288. 

 Vibrations of atoms containing 4, 5, 6, 7 and 8 corpuscles (Thomson), 39. 

 von Hugel, Baron A., Elected Fellow 1906, Feb. 12, 390. 



Warburton, C. and Pearce, N. D. F., Exhibition of new and rare Arachnids 

 taken near Cambridge, 176. 



Ward, H. Marshall, On a Problem concerning Wood and Lignified cell- 

 walls, 3. 



Exhibition of Lantern Slides of Fungi, 179. 



Webb, H. A., Elected Fellow 1906, Feb. 12, 390. 

 Well-sinking, at Graveley, near Huntingdon (Fisher), 181. 



Wilson, C. T. R., On a Portable Gold-leaf Electrometer for low or high 

 Potentials, and its application to measurements in atmospheric 

 Electricity, 184. 



On the measurement of the Earth-air current and on the origin of 



atmospheric Electricity, 363. 

 Wilson, E. A., The Penguins of the Antarctic, 178. 

 Wimshurst Machine, Some methods of increasing the Spark-Length of the 



(Palmer), 60. 

 Wood, P. W., Elected Fellow 1906, March 12, 391. 

 Wood and Lignified cell-walls, Problem concerning (Ward), 3. 

 Wright, J. Aldren, Elected Fellow 1905, May 15, 179. 



Cambridge: printed by john clay, h.a. at the university press. 



