INDEX SLIP. 
Townsend, John S.—The Diffusion of Ions produced in Air by the Action 
of a Radio-active Substance, Ultra-Violet Light, and Point Discharges. 
Phil. Trans., A, vol. 195, 1900, pp. 259-278. 
Diffusion of Ions, produced by Radio-active Substance, Ultra-Violet Light 
Point Discharges. 
Townsend, John S. 
Phil. Trans., A, vol. 195, 1900, pp. 259-278. 
Ions, Effect of Pressure on Rate of Diffusion of. 
Townsend, John S. 
Phil. Trans. A, vol. 195, 1900, pp. 259-278. 
